About as bulky as your average 2 foot king, I would imagine. If bulk and small size are both very important, I'd advise you to go with a male Kenyan Sand Boa, as those are going to be about the only bulky snake that stays within your size range.
WHSs are also in the size range and are almost as bulky as KSBs (you didn't mention that...), but I don't like clones of what I have.
-Ryan Hardwikk (aka Member #6667)
My snakes:
0.1 Kenyan Sand Boa ~Nephthys~ (aka "Linky")
In a better place: 1.0 PastelWestern Hognose ~Charon~ 10/3/07-4/24/09
If you need/want to know anything about Hognose snakes, just ask me.