You could certainly fit a Nexus 7 on the front. I mean, the thing is the size of a Minirig SC. Heh... a BFL single with power brick at the same GH/s is smaller than the PSU of the Avalon. Comedy gold.
The size of the unit itself may be the part that gets you into trouble with your own customers.
Heh.
It will hopefully be funny when the review comes out and BFLs size becomes it's biggest limitation. (assuming it doesn't also overheat in that little clam-shell of a box)
EDIT: BFL forums is down? Perhaps they ran for the hills??