I have no idea if this has been done, as far as I am aware it hasn't, so here goes:
I think having a Sentry Buster as a new Hale would be awesome, a few featuers I have though of were it's taunt being the Sentry Buster's detonation animation, which would obviously blow up anyone near it (including buildings) but obviously not actually destroy it, when the round starts with the Sentry Buster Hale, an edited audio file of "Attention, we've got a Sentry Buster!" would play, and it would attack by headbutting you (technically using the Ullapool Caber, since that's what real Sentry Busters do in MvM).
I'd need a lot of help making this (if it hasn't been done) since I know very little about making stuff like this (I'm more familiar with Java).
Any ideas or suggestions are welcome, and if anyone could help me make this Hale, that'd be great!
PS- Sorry for the poor idea pitch, I'm tired and have flu...