I use it on my MK3S. The container covers the bed entirely and doesn't hit the nozzle head.

Fan size is 120mm. I use M3 screws and nuts about 40mm in length. You should find the slowest fan.

I included a fan cover. If you don't want to use a fan, you might want to find a blank cover else where. 

I also included “contactless” trays that will fit inside. 2 trays per row.