I am eager to see your future remixes. In the beginning, caps were intended, but I left it uncovered for heat disipation (stepppers and drivers can get warm) and for everyone to see the innner mechanism. Increasing widh is pretty straightfoward, just increase the length of all alu and steel profiles. Perhaps the alu 15 x 2 mm profile should be reiforced in large widths for it not to flex. I will upload a video or a gif of it working as soon as I can.