I always wonder how atrociously expensive the little scale models architecture firms make are, I’d imagine this one uses real tiny hardwoods on the floors and stuff as well so it’s even more eye wateringly expensive.
It's pretty atypical to use actual materials in the model. When you need to see the actual materials together, you just use samples at 1:1 size and either hold the individual samples near each other or at most build a small corner to illustrate where things will come together.
If an architectural firm has one in house it’s sending a message about just how boutique (and expensive) they are.