uh... I think that you're asking whether or not somebody has bored out their own throttle body. Is that it? I'm pretty sure nobody has, most people just purchase an aftermarket unit.
I've seen a few examples of Betas running custom built intake manifolds along with Honda CRV throttle bodies (I think they're something like 62mm or something?), but the cars were from foreign countries so there's a language barrier there... Would love to get some info from the owners.