Another update.
Discovered shedloads of water in the footwells after the recent freak snow day we had. Stripped the interior again to soak it up. Turns out i had left a rubber bung unsealed in the firewall when i was exploring while swapping the GTT dash a while ago.
Today i had the interior out again (getting quicker each time lol). A friend came over to help me switch the Campus interior loom for the GTT one. Its mostly done atm, 95% plugged in, Hopefully we will be refitting central locking and electric windows as a regular GTT would and also waiting to see if another friend can help in moving the immobilser power feeds into the new GTT loom as the campus came with an aftermarket immob. Its all spliced into the main 2 plugs on the heater box.
Also got most of the scuttle loom plugged in. I need to buy a new starter motor to battery lead as ended up cutting both by mistake

Also switched the GTT speedo and turbo gauge hose, luckily the hole for the GTT cables was just plugged up with a bung near the steering coloumn. Easy job.
the GTT and campus loom are quite similar, its pretty much a case of plug and play down in the footwell corners, not forgetting the earth cable each side, (dont forget the GTT fusebox. 1 or 2 lives to route through to the scuttle area and obv the speedo and vac hose for turbo. scuttle loom comes in from left side of heater box , ignition barrel lives can just be unplugged and plugged in again so we can keep the campus barrel. I think thats pretty much all thats needed to get the GTT dash in and working afaik. I did notice that the GTT and campus brake light switch above the brake pedal werent the same, so will need to whip that one out the GTT shell later.
no pics, its just a big pile of wires afterall. who's interested in that...
I bumped into a friend of a friend last week , who claims to have the orginal airbox in the shed. hopefully i can get that back. He also named the lad who crashed the GTT and told me the fuel pump is from an XR3i lol. so i guess a new pump is gonna be needed to be sure it runs good eventually.