I'll repeat the statement that has been said many many times to prospective Z owners. "always buy the best shell you can to stat your new project". Ones that have not had rust repairs in the past will generally be better as they often rust again. We all know how costly it is to re-fabricate section that have suffered rust and you never seam to get all of it. Now, most of us would much sooner have a RHD car but you try finding an original, unrepaired UK car with no rust. If you do then it will probably be outside most of our budgets. So you start looking at UK cars that you can afford and the extent of rust or bad repairs increases dramatically. You tell yourself that you can fix it up yourself or you have a mate that knows how to weld and its not going to cost much to get it back on the road but the reality is usually different. If you do get it through an MOT and back on the road at a reasonable cost then the chances are you will continue to chase rust around at every MOT time. You could not use it and keep it in a good environment so it doesn't keep deteriorating but whats the point of having a zed you cant use?
This leads me onto the alternative and the cars you all hate sooooo much (and I'm still not sure why). The "work of the devil" left hooker. It is still a zed you know!. Although I'm sure a few of you don't think so. A couple of years ago I was of the same opinion as most of you but then I started looking with open eyes at just what you could get for your money. Rust free RHD cars are out of my budget but not so with LHD cars. When I say rust free I mean no extensive rust but may have minor surface corrosion in places. I see very little point in buying a rotten LHD car. So you now have a solid base for your project for way less than the equivalent (if you could find one) RHD car. Now you need to decide whether to leave it LHD or for under a couple of K, convert to RHD. The other thing to consider is the rust free condition of everything else, not just the shell.
Anyway, this is just my opinion and I'm not trying to convert people, just saying open your eyes a little.