Several 4x2x2 enclosures. Buy or make?

[medicinhed]

Situation: In a year to two years I am going to need 3 - 4 larger high humidity capable enclosures.

Potentially housing: 0.1 BCI, 1.1 Woma pythons, 1.1 BRB, 1.1 BPs.

Which is more cost effective:

Buy commercially made Boa/Python enclosure. (3-4 separate 4x2x2, or Condominium style with 3-4 built together in one big rack.

Build my own.

Commercial steel rack systems. 4 x 2 x 3 (Each shelf can hold 400 lbs.) and use large acrylic or glass enclosures. With this option I can fit an enclosure on each shelf.

If, although unlikely, that I would get an albino male burm, would I need a
6 x 2 x 2?

I am in no rush to either acquire the specimens, or acquire the enclosures. I'm just planning for far down the road.

Thanks for any tips or pro tricks.