Lego seems like ideal, it also has the advantage of allowing easy desassembling-reassembling if you are not satisfied with the result. I just wonder how the finished thing looks like to non Lego fans...All the diffusion I have seen so far are abysmally thin. little disappointing.
I'm thinking of building one out of Lego in our living room, my partner is a Lego geek and the 1 cm wide blocks allow for diffusion up to 20KHz, I hear up to 16KHz and he up to 14KHz so I might just save myself the time and do 2 cm wide blocks (up to 10KHz Diffusion).
Anyways, are you aware of bigger Lego blocks or those you mention are the best choice? I remember my kid used to play with Legos for small children that are much bigger but I can't remember how well they fit or if it is possible to combine them with the standard ones.
Edit: Lego Duplo it is called and the can be combined with the classic ones
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