Modular Shelf Riser

I collect Transformers and when I have them in vehicle modes, there is a lot of wasted space above them. I wanted a riser that I could use to display a second layer of them above the first but I couldn't find anything that quite matched what I was looking for. I designed this to be very simple, it's just end pieces with shelf pieces that slide into the slot. If you want to use more than one shelf, the end pieces are wide enough so that you can put the ends of two shelves inside one as a middle support. I have three different heights of end pieces but all of the shelves are as long as I could make them. You can just resize them to make them shorter in the slicer.