Greg, this sounds like a great project. And a great choice of frogs, especially the pums, but that is a my own personal taste.

Do you already own frogs? Reason I'm asking is that mixing species is not recommended. Granted, pums/thumbnails and auratus/leucs are different sizes and there's no chance of hybridization... I've seen this sort of species cohabitation in certain breeders, but in much much larger vivariums to prevent stress and to make sure all species were had a perfect environment for them (climbing space for thumbs and pums and very large terrestrial space for auratus and leucs). But in general, we advise against mixing species together...

Eric