Totally Straight

I know some were asking how you build the shelf on the bottom after you cut a hole in the door with a jig saw.

Take a 2 x 4 and screw that horizontal on both sides of door across from the hole.
Next take a strip of 3/4 plywood and screw that to the 2 x 4
Next take sheet of plywood (or similar substance) and screw it across on the bottom
Bingo !!!!! Your done, you now have a inset sewing machine !!!!!!!

This was the perfect depth for both of mine, yours might vary.