while I understand you may want this to serve as a giant paperweight. I do have a minor suggestion. Get a metal dome at the very least.
Its the one part of r2 that everyone touches.
Later on, like all life size r2 owners, you'll upgrade parts here and there. Get yourself a nice frame too. If you have a nice frame and a metal dome you'll at least have the opportunity to upgrade parts if you want in the future.
regardless - prepare yourself for an addicting, frustrating, yet ridiculously fun and rewarding experience.