Solid base for 5x4 Gridfinidrawer

This is a solid version of the drawer base to fit GridfiniDrawer . I used the parametric model to produce a drawer size of 5x4 Gridfinity units, but I wanted to just store some random tools in it, and didn't want to waste filament just creating a 5x4 bin. The base is a reduced thickness to allow slightly deeper objects, but fits into the draw sides produced by the parametric model from useyourwords. I used an exported .STL of the gridfinity draw from the original model, loaded it into Onshape and recreated it using derived points from the original, but using a solid base rather than the grid.