Can't answer the question whether it's possible with what you can buy in South Africa, but I am pretty sure it's no problem. Pretty much everything can be found in any DIY store, there's few things that are specifically acoustic or studio related. If you can buy wood, mineral wool, fabric, screws, staplers and power tools you're 90% setReally? But can you design according to what's available in my country? And did you design Max's wall - wall, roof - floor? Because it looks amazing!
And yes, Mika designed both studio rooms the way you see them. Basically only the red fabric and the new lamps in the live room were my spontaneous choice/ideas, the rest is what Mika planned and designed after we talked what my expectations were.