That would work. IMO the idea is the
Gavita is 22" long, so I would have the mover go to the left or straight whatever 22 inches, then return to the center then go to the right 22". You got me on that?
With the agramover and I believe the 5.0 also which you have can't you just get a piece of strut attach the "slave trolly" and motor then use another piece of strut at a 90 degree angle to make your bar kits. All 1/4" hardware.
It is just extruded aluminum you can get at at HD or lowes anyway. You'd have to make sure to drill holes real well so everything isn't all leaning towards one side/lopsided.
The kits aren't expensive to me, the whole system pays for itself with increased yield anyway. Times to be cheap times to say hell this isn't worth my time.
My brain is a little slow today cpl too many beers last night mixed with a lot of finger hash.
What are your room dimensions anyway Doug