Is your measurement of roughly 6.6" height with the lid on? I know it doesn't add a lot but I see your lids are under the rack instead of on the tubs. I have planning on keeping lids on and drilling holes in sides for better heat/humidity retention. In the process of designing my rack for 2 BP's that I plan to be purchasing at the end of march at a show. I want to buy all the sizes I will need as they grow now and have them ready and have my rack fit all when I build it. Plan ahead and build once. I'm gonna order them and pick up later this week so I can measure then just thought I could get a jump on planning cuts and measurements. Laying out the rack in Fusion 360 (3D cad program) so I can bring a layout with me to Lowes and have them cut the wood for me.