There's an ocean between us and the States... and as far as my knowledge goes, they haven't sent any G.I.'s across to annexate Europe and say we can't use cars developed around shorty LiPos.
Plus, if regulations really start naggging about shorty developed cars, there's a simple solution: test it once with a LiPo cradle to hold to saddle packs stacked on each other and include it in the kit
