Slightly smaller than the Atari's and has a really nice ergonomic and quality feel to it. Honestly, it's been my go-to TB all these years while the Atari's sat in storage. Be great if it could ever be adapted properly, but totally understand if not worth the trouble. Seem to be a handful on eBay at the moment, but kinda pricey.
Never had a reason to open her up (she's built Tonka tough - pun intended), but if it comes down to it, perhaps I could assist in helping with tracing the leads, etc.