For great rc car model Armadillo truck TRX4M modular edition by polymech, magnetic box attachment for placing on non standard or standard trx4m chassis, includes cutout back floor with and without hinges for tamiya 1/14 5th wheel coupling. Box attached by eight 4x2mm magnets, can be took off completly or just cover slided off. I used velcro to attach batteries in it.

For great rc car model Catmaw AFV by polymech and superb turret for it by tom007 i designed rotatble turret mechanism. Based on printed bevel gears and MG90S 360 degree servo to make whole hatch rotatable by rc reciver so we can make smooth slow or fast moves if controled by pwm. Round magnets for attaching safely and swiftly all you want for hatch like tom77 turret. Fast and quite easy mod - just print parts, assemble them easily