Hi Scheggaboochee, congrats on your new purchase. The YCC accessories do add detail, but it's really up to you on whether the cost of components is justified when comparing the additional detail.
YCC makes solid components and I really like the various details added so I took the plunge. The base model is excellent in its own regard. The plastic lift cylinders do detract somewhat as the colour match is not as good as the painted metal cylinders.
As for finding parts, I would go straight to the source: Chou at YCC,
info@yccmodels.comOtherwise, you can try a Google search and see what comes up, but shipping from multiple vendors can add up. Best of luck in your decision and your hunt if you decide to go that route.
I hope this helps. Take care and all the best.