About eight years ago I had very similar plans and actually built a multi-unit melamine enclosure ....but I ended up not using it and ordering an Animal Plastics setup instead for several reasons.
Melamine is insanely heavy, keep that in mind. By the time I had completed the cage it weighed easily over 200lbs and could not be moved without at least three adult men.
Then consider that your heat sources should be shielded in some fashion....a lot of people typically place their heat sources under a sheet of lexan (plexi glass) or actual glass and then waterproof it with silicone......either way it's a pain in the axx because you have to route it into the melamine. The easier route is to just use Radiant Heat Panels which mount right to the top of the individual caging units.
THEN you must consider the amount of venting for each cage which will control your humidity levels.....this is a trial and error process, that only you will be able to determine.
As far as designing and how to assemble it? That's on you and your design skills. You can maybe find some pictures of such units online but overall there's not a lot of resources. The best advice I can give IF you would like to proceed with melamine at this point is to seal the cages extremely well....moisture+melamine=bad news.
Can you see why I went with AP cages by now? By the time you complete construction on your cage, you would be pretty close in budget to an Animal Plastics cage where ALL of the cutting and difficult work is already done.
Melamin racks with plastic tubs are a different animal as your heat tape, poop, and urates are seperated by the individual tubs.
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