Ok, I have thought of, and shall be making the required purchases for the unique "Mach" thing for this and all gaming nights going forward. (Similar to Chainsaws awesome beer making thing)
I'm going to pick up a cheap second hand steering wheel & pedals for the PC, I've got one on snipe today which I've got a good feeling about, I'll have this wheel set up right in front of the main TV (42 Inch) during the day only (in the evening we can play shooting people in the face as there will be no kids!) I've a tonne of driving games and Assetto Corsa especially is supposed to have very realistic FFB settings (
Though we'll be the judges of that thanks!), maybe do a few timed laps of the Nurburgring or the like, I'll record the demos and stitch a video together after the event.
The kids will probably want a bash, I'll also try to convince the wife to have a go, and seems to be something we don't normally get to do all the time.
Future gaming nights I can bring the wheel to Chains / Fix for the afternoons when we sometimes have the kids around at our LAN nights? I'm sure it would keep the lads entertained Fix whilst we swap porn, er, music...
Evening setup I've pretty much planned, I'll take my 2 screens off the mount and put them on stands on either side of the TV, one of us can have the TV, the other 2 have the screens so we'll totally be able to see each others views

I've got a few logistical things to do with our sofa as hopefully we can change it from a corner sofa to 1 long sofa so we can all sit side by side.