I also saw this car go through at Barons and it was a standard 320 at the time, albeit it had the 500 style front wings etc.....very poor fit and as had already been said, when you opened the bonnet you could see the road through the inner wheel arches ....in essence there wasn't much in the way of inner wheel arch.
Car also had a blown head gasket....lots of gunk in the expansion tank and it pressured up as soon as you started the car.
if the ecu needs wireing, it will be a nightmare. the megasquirt i have on mine was new and fitted with full instructions. it was still a long slog, would hate to have to try to figure out what someone else had done wrong to fix it, would be easier to rip it al off and start again.
Looks fantastic (fibreglass or not) and I'm tempted to buy it. It's definitely one of the Hughes' recently sold kits so the turbos are almost new. There's lots of mods on it but should be easy enough to get it all working properly. Someone's spent a lot of money on it.