I have a question for those of you who own Freedom Breeder racks or ARS racks. With all the recent talk of building these style racks I have decided to try this myself. I have worked out all the details pretty much but I can't find bus tubs in a decent size. Even buying from Freedom Breeder or ARS directly I can't find a size I like. It seems the medium size is roughly 22" x 16" and the next step up is a cb70. The 22x17 seems really small. So do you guys just go from that to a cb70 or is there an in between tub out there I'm not finding?