So as promised, returning for the verdict.
Well the Photo booth was a HUGE success, very popular and was getting a work out for 3 hours or so. Everyone seemed to have a great time and I haven't heard so much laughing for a long long time.
On the technical side of things, I had hoped to use my remote radio shutter so they could self trigger the photobooth. However it kept sticking during testing and just bursting 20 shots off, so I abandoned that idea and chose to man the booth myself. This turned out better I think in the end, as there were various heights and widths of groups from single participants to 6-7 people. Also I found the D7000 I had hoped to use for photo boothing lacked a few external plugs (flash and remote) so went for a D700 - 1 umbrella and 1 on camera flash(bounced). I was amazed the eneloops kept their charge for the full night and at times when others were playing photographer they were getting a hard work out.
A few of the results
My Uncle relives the 70's
My Nan still knows how to Party.
Bride and Bridesmaid
Larger group.