Well done some welding. Internal bracing is in. This is the basic layout. Can squeeze 4 GR02's , 1 huge lifter motor and gearbox plus a decent sized battery. Will have 3 hacked TZ85a's.

The control for the lifter is going to be electronic through a Arduino Nano. I've been developing the code for axe control and decided that a few small mods it can be used for a lifter including torque control. This allows me to remove the need, and weight, for a mechanical torque lifter. Shame I decided this after I bought the mechanical control