Hmm, sorry to say, I don't much like that - it looks like you've put AND gates in for the final drivers.
From a logic perspective, aside from tristate drivers, I think you can just count all pullups as pullups. An inverting superbuffer is drawn as an inverter, a non-inverting superbuffer is drawn as a buffer. I'm not aware of any special symbol for a superbuffer.
These resources might be of interest:
Chapter 1 of
Mead & Conway, the classic textbook on VLSI:
http://ai.eecs.umich.edu/people/conway/ ... V1.Ch1.pdfA short slide-deck on inverters and buffers in NMOS and other technologies:
http://xa.yimg.com/kq/groups/21151486/4 ... teering_logic.pdf