I have two racks from Animal Plastics and they hold heat/humidity very well in my OP. AP does have a longer turn around time so if you do order from them you will have to have temp housing for your animals until your AP racks arrive if you get the BPs first. If you want to build your own rack using PVC, look to see if your local Home Depot carries 1/2 inch sheets. Mine in Pittsburgh has 4'x8' 1/2 inch sheets for under $70. If you pick up two breeder size BPs in April, by October/November they should be acclimated to their new environment enough to pair them. A cooler incubator would be the least expensive route to take for an incubator. There are plenty of DIYs out there on them. My first incubator was a cooler and fit 3 clutches. Never had any issues with it.