I'm thinking about getting my dad to make me either 3 modular stacking vivs, to a design I'll get him to agree to without seeing the design.
Or the alternative is a custom shelving unit that is made to hold Exo Terra vivs. The trouble with shelves we can buy is that they tend not to be 45cm deep to hold a viv, and it would need holes in the right places for ventilation and wiring.
I'm not sure if we'll go for plan A or plan B, but I will keep an eye on this thread to see if there are any ideas that influence what we do.