Nice entertaining job that you wouldn't wish on your worst enemy!Bonded windscreen makes life worse as seem to remember some screws right up front with next to no access, could always remove the screen and get Autoglass to refit later.Have you checked how much a replacement matrix is gonna set you back, what are the wheels and tyres like, how long till MOT and tax, etc!Why not clamp off the feed and return pipes to the heater, take it for a burn and see if you still think it's worth the agro, if not you can probably pick one up for about £1500 without getting too grubby at all.Happy hunting.