This the sort of stuff you are after
http://cgi.ebay.com.au/PELICAN-PICK-...dZp1638Q2em122
We call that pull apart foam. You just don't let kids or fiddling partners near it or you end up with an expensive pile of little bits of foam.
Savage: FLM Conversion, 6s, MMM, CC 1520.
Mini-T Pro: Micro Pro 6800kv, Lipo, HS-81mg, Dirt Hawgs
M18MT: Quark 33A, Y22S 6000kv, FP 2s Lipo
LRP S8-BX: RC-M Conversion, Tekin RX8 B1600KV, 6S.