homemade toilet chair project?

Looks too clean for that

maybe just clearing the way for farts so the cushion doesn’t absorb them

It would help prevent the muffling effect you get from a cushion. If you were really feeling creative you could attach some kind of trumpet to the hole.

or possibly a metal bowl for a premium echo

Or an elaborate series of pipes.

I can see how experimentation like this could easily lead to 20 chairs with holes in them. Now I just want to know if he found the perfect addition - perhaps a tuba or an Alpine.horn or a vuvuzela.

finally put it all together, they’re trying to recreate this for less flexible people

Ah ha, it’s silly to expect people to bend in half to.hold the bum trumpets, far better to cut a hole in a chair and fix the trumpet to the underside (but not the bottom - jumbling up.your terms could be a dis-arse-ter).