Gridfinity base for IKEA SKADIS display shelf

I was inspired by this model, but I have a different model of shelf, so I started from scratch. This is specifically for what IKEA calls the SKADIS Display Shelf. It's too long to fit on one tray on anything other than an H2D, so I split it up. The two pieces can be printed separately on the A1 mini, but can be on the same plate on anything else.