Bed

Heater

Cut 4" fence wire transition pieces, wrap nichrome around them
Cut 6" of ga 18 200C wire
Cut 6" 3 mm tight woven fiberglass sleeve (covers ends of 4' long heater element (core + shroud)
Strip 200C wire on both sides, tape (electrical) to prevent fraying (stripping first appears to work better, otherwise it's too difficult to strip is tape is already there)
Tin 2 ends of

Assemble idler side.
Mount idler side on bottom of frame, right next to corner piece, with nuts next to frame.
Assemble carriage side.
Open idler side, keeping it mounted on frame. This will allow fitting of axis to it.
Mount motor side on rods, keep loose.
Fit motor side to frame, hanging it on the top of the frame, and adjusting rod lengths so they are slightly above the working surface.
Take off axis, mount motor, tighten motor side fully.
Mount motor side on frame, and in idler.
Close the idler side.
One axis mounted. Now mount 3 more.