Definately a scrapyard challenge

[motoxy]

I have spent an enjoyable afternoon staring at the screen. My problem was enough strength to overcome rorational deflection and keeping everything close. I think I may have cracked it using 100 x 50 x 6.35 al channel. Although I have shown a single section it would be no problem to bolt another piece back to back if it was required on building. The rails are close and the leadscrew is also very close. Tidy.Okay comments please.Bruce

I changed the design slightly for the assy and put channel at the top to support the motor mount.