IZZHARD: you really need to lose at least 2 tanks, you cant fit them in a tight space like that. Storm II uses the same motors and it hauls 10kg worth of battery for 36V so you pushing it weightwise. 4cm Vulkanized rubber in the inside is way too much (that is also the case for Poison).

POISON

Looks ok at first glance. You will need a lot of batteries for that so its a tight fit.