I would have a look at that door - if it really doesn't shut, then Rockhopper is spot on, it will need to be jigged, and you are looking at a chunky bill, not DIY unless you own a body shop. If the door is simply ajar, and shuts well (and all the other doors are good), then it is more of a "uneconomic but fun" project, than "crazy". Though I would still want the alignment of every thing checked pretty carefully before driving it.
The oil leak is probably the cooler. The next step is to work out the condition of the engine - it has to have been looked after to get to 170k, so it may have had loads of work and be Ok. On the flip side, it may have been run with the leak and utterly seized.
I think it is a breaker, but if you have access to a body shop, might be a saver. If you after a project, there a ratty GTAs out there for cheap that need DIY love. You'd only take this on if you were bloody minded and wanted to save it.