I've got a V-18 rack purchased and on hold for me from Chris. I'm picking it up at the NARBC in a couple of weeks. I'll get a good chance to look at his hatchling racks and if I like them, I would consider those as well. I just wasn't sure about the gap with regards to baby corns.
My thought was to use the smaller tubs for the brand new babies and those that don't sell get moved up to a 6qt rack. However, it may be in my best interest to just get the 6qt racks and get one from AP that can hold a lot of tubs.
With regards to the AP racks, can you use them lidless? I wasn't sure if the tubs would be tight enough. What I may have to do, regardless to what rack I end up purchasing, it creating a little shim underneath all the tubs to make sure they are flush against the top of the rack. I worry about this because the DIY rack that I have is so tight I can barely get my tubs opened. I house subadult and adults corns in those while the top rows are my ball python hatchling racks for now.