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I was having a chat with Eric a couple months ago about making a demo excavator out of the liebherr 1280. So I looked at some pics of the Kobelco 3500 and thought I can design a machine like this. So I had my lr1280 in pieces so I started building. I am calling this machine the R300d I started with the house  I am adding most of the details as I build   Note on last I will be adding another radiator to the machine Here is a above picture of the 300 ton vs my 50 ton
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Next came the a frames for the boom set up. This will have modular set up for easier transport.  Here is the adapter for the main boom.  In this picture you can see how the adapter will set on the machine. You can also see the main plumbing for the boom and a few of the walkways.  I added a guy to show the size of the machine 
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looks great so far! think youve mentioned this before but do you have a cnc machine to cut out alot of the parts now? they look perfect! wish i had the skills and know how to build stuff out of plastruct, i would have built my own 31000 by now and a 2250! 
Brandon my youtube channelMy Facebook Page
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Here is how the main boom will look being transported  Here is the main boom. I made the cylinders out of aluminium rod, the ends are flared for hold resistance which works great  You can see in this picture I have added a cab. The cab is a oversized cab design for added comfort for operator, it tilts 30 degrees and is fully armored. I will be redoing the front bars making them smaller 
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Brandon I have a laser cutter which does not cut styrene. So on alot of the boom pieces you will see I design the piece on CAD and then cut a master template out of plexi and then I clamp to styrene and cut out. All of the body paneling are all cut free handed or with ruler for straight edge. So thanks for saying they looked cnc'd Here is the machine next to the Hitachi 870  Next will be the short boom set up. I am doing a short set up first and then I will do a long boom set up Here is the middle section, everything will have a double ram set up 
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Here you can see the short boom set up   
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With the boom done I moved onto the counterweight setup  The set will be a 85 ton set up that will consist of a 8 piece system  Each piece is designef and then cut out of plexi . The system consists of a base plate that the stones will mount on. Then it will be placed into the weight box on the rear. After all the weights are on the top plate is added   I started adding a few catwalks 
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Well you can not have a demo excavator without a demo attachment So I made a huge cruncher   Here is another pic of the counterweights broken down 
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Here is the last for tonight This shortboom set up is 30 meters reach  This machine dwarfs the 870   Hope you are enjoying this build coming up I am added all of the handrails Jason
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Wow=>:-< thats all i can say. What some people can do out of flat sheets of plastic just amazes me
SAFE ALWAYS
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Excellent beast Jason.......love the idea of unique design.
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I love it! That is an awesome design, great job!!
Mark L.
It's what you learn after you know it all that counts
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That's sweet!! I like it!
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Jason, I am for the bigger equipment and you have made a real monster piece of equipment. Like it !
“A tiger doesn't lose sleep over the opinion of sheep.” ― Shahir Zag
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-Unknown
“Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.”― Arthur C. Clarke
"Anti-social behavior is a trait of intelligence in a world full of conformists" - Nikola Tesla
" If you think it's expensive to hire a professional to do the job, wait until you hire an amateur ". Paul Neal "Red" Adair {Wild Well Firefighter for those who live under rocks}
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Jason. THAT'S NICE!!!!!!!!!! Excellent scratch building!! I have a couple of questions: Where did you find the walkway material? How are you making the hinge and latch details on the side panels? TM
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Tom
It's pretty sad when the only modeling tool you own is a box cutter.
If the only tool you have is a hammer, you start to see every problem as a nail. Abraham Maslow
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Wow this is insane.
//Niklas Eriksson
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I was watching this over an Hansebubeforum and I have to say I am beyond impressed. The craftsmanship is astounding, but the design blows me away. It seems really clear you though this out and it pays off. The cylinders are fantastic for scratch made.
-John
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Cool lookin big machine I had an idea for even a bigger demo one based on an 18000 crane might find it in a real old post just an outlandish concept !
Chet
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Amazing work, Jason! What a unique idea for a build, I am totally blown away by the project.
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