In album you can see the 9 different parts I used. All colors except white are a single 0.2mm layer. The white one has two 0.3mm layers, you can use more but with two the back is still flexible. As you can see the colored ones have a small border the same outer dimension as white piece making them align perfectly, as long as you don't accidentally move them. In between prints remove the alignment border and skirt when on, skirt is not really needed as the alignment border is basically a skirt. If you need to keep the bed warm depends on what build service you use, with the one I use I could let the first 5 colors sit overnight on a cold platform without them getting loose, needed to wait for the final cyan color to arrive.