by Mitch » Fri Mar 22, 2013 7:46 pm
I am assuming that you are referring to the plastic parts... You say "accessory parts" without knowing what part you need I would say you will need to fabricate it from...
1. solid balsa or
2. built up balsa or
3. pink foam board. It will shape and sand well. Model RR's use it. Get it from Home Depot or Similar
I might be of more help if I knew what part you needed. Good Luck... Mitch