Grabthar - 150g modular combat robot

This is a 150g combat robot (which is the antweight class in the UK and Australia, and the fairyweight class in the USA), designed to be modular with different interchangeable weapon options. I designed it initially for my youngest son who wanted a hammer bot - my working name was Grabthar but he named his Smasher (with which he has had some success at our local competitions), so I also made a lifter arm for it to fight under the former name. Since then I have made a horizontal grabber option (which is a loan bot for our local group under the name Claw-dine), and a lifter/grabber module (which I have fought under the name Scroggin).

All versions of the robot are designed to use N20 gearmotors (I recommend 50:1 / 500rpm ones) for drive, a small slide power switch, and a 3mm power led. ESCs and receivers there are too many options to list, and I recommend discussing with local bot builders if just starting out. The motor mounts should be held in by four M3 bolts and nylon threaded space