Racks in themselves are the more preferred option for housing large quantities of BP's in small spaces. though they can be pricey if pre-manufactured. and a royal PIA if home made. if a 10 or 12 slot rack is to much up front, you can get them in smaller slot choices, 3-4-5-6-Etc. although in the end you will pay more going with 2 or 3 smaller racks than the one large one upfront. we had this choice available to us this year when deciding on a hatchling rack, and we chose to purchase it pre-made from animal plastics and went with the IRIS330(15) 15 SHELVES HIGH, 45 TUBS TOTAL . they are lighter, easier to move around when needed, easy to disassemble for moving, plus the racks pre-made you will have tubs available to you if any of yours break, nothing worse then trying to find a tub that has been discontinued or redesigned and wont fit in your home made rack.

as far as the gene idea's i agree with Deb, ditch the poss hets and get something you want to work with, it is a hobby, get what you enjoy, then work from there. i personally do not plan on ever purchasing a Het for anything, unless it is just something in there on the visual base. IE: Clown Poss het O.G.. although eventually i may try to prove it out, my main focus would be the visual Clown breeding's.

Good Luck either way you go.