The boot lid on my S1 is much more rotten than anticipated, so a solid replacement is needed! May consider getting one made up by Bob at alfapanels, but a good metal replacment is first choice.
I can wholeheartedly reccommned Lazlo (ebay member 127_sud). Excellent communication, pretty fair prices, and very helpfull if you're seeking something he doesn't list in his shop. Only source i know of for metal strut pan bearings! (£25 each last time i checked) He does good deals on multiple items...