Pete,
I use to work at a crash repairer, so have a fair idea on what to look for. I can help with compiling a list of bits you'll need, then its up to you to hunt them down second hand. Cars are normally written off because the repairer will quote top dollar second hand parts, or new parts. In most cases, forums like SAU can help you hunt down the bits you need and save heaps. Do the labour yourself, and save more.
Nothing wrong with a bit of DIY.