The frame is such a fuss to construct. The worst part are the controls, one direction is "fine" but beyond that, I can't even figure out how to make it go up or down. Wouldn't be so hard if the engine would always stick to the frame.
yeah, the mainproblem with framemotors is that they behave like a frame for the top side, but like a normal block for all other sides. that can be seriously confusing when building more complex things with them.
here's the most simple design for a frame motor.
Compact 6-Axis Frame Engine
it has the little flaw that the up/down engines get stuck cause they have no power source when in moved position, but that's easily fixable. it's a very simple design and perfect to understand the basics of how frame motors work.
you also don't need wireless redstone. everything can be wired downwards into a control centre