I'm in your boat regarding craftsmanship, but I think you should look at the RBI juvenile racks. they're around $230 or $240 for a 16-tub juvenile rack. that's pretty hard to beat, even if you're a skilled carpenter given the quality of materials and space they provide. also not having to worry about the proper amount and wattage of flexwatt counts for a lot.
what kind of set-ups are you using now? you could keep whatever you have currently and just incorporate the baby rack when needed.