ZMR160 remake - 3.5" props, angled motormounts, cam mount, rear cap

Do not like your ZMR160 quadcopter? Too low on power with 3" props?
Frame itself is wide enough to fit 3.5" props (even slightly sanded down 4" too), but not enough space between motors - so you need to angle them.

Complete solution:
- get 30mm standoffs (available everywhere or just cut down longer standoffs and make thread)
- print 2xL and 2xR motormounts
- screw 1306 or 1407 (recommended) motors on angled mounts and use 3.5" props
- print front camera mount and use HS1177 instead