Parametric stand for my parametric bottle tray

This is a stand which allows my parametric bottle trays to be stacked, although I guess it could have other uses. It should work OK with the customiser. The variables to input are the inside width, the inside length, the inside height and how thick you'd like the walls to be. As well as that, you need to decide where you would like the opening. The choices are "0" which would make a cage. That would make it difficult to get at whatever is underneath but I've left the option in. The other choices are "1" which leaves an opening along the length (x axis), "2" which leaves an opening along one side (y axis), 3 which leaves openings along both sides (makes a "U" shape) and "4" which leaves openings at both ends. Basically, measure the tray (or other object) that this is to go over, and add a couple of mm for clearance and use these as the inside dimensions and then decide where you want the opening to be.