I had planned to build an all display unit similar to zombie&lemons', but I think I'm going to go with a rack instead and just build a single display unit on top of that to house my RTB.

I am thinking something like this [dimensions aren't even ballparked, this is just for a visual]:


I think I'll make the top unit seperate though, to cut down on weight as I will probably use melamine. For the 3 levels [could be more?], I figure the top will be smaller tubs for babies, middle medium sized for males, and lower level the largest for females. Should I have a 4th level for breeding? The area this will be going will be a 4ft, max of 5ft long(if this could help give an idea for how many tubs for each level).

Now for dimensions, which size (brand included), should I use for each level [babies,males,females,breeding]? And for heating, 4in flexwatt?