I removed the wings on the side for attaching to MDF and added an easy way to generate both halves of the main plate in scad.
New: Added optional sacrificial plate. Stick the PCB down with double stick tape. Helps keep the PCB flatter than side clamps. Either print the STL or laser cut the DXF. Laser cutting is better if you can because cast acrylic won't have any potential warping that prints do. The channel coming down from the top of the plate is for connecting the auto-leveling alligator clip.