Well today me and my brother went ahead and fitted the new door, the whole process actually went very smooth, but did take quite some time.
The process would have been much much quicker and easier if the replacement door was from a Sport model. Since it was from an SE it needed the handle and all the black trims (that come matt Black on the SE) swapped over with the shiny black ones from my old Sport door.
Here are the before pics:
Once the old door was off the car, you could really see how bad the damage was, it was not only dented, but buckled out of shape:
I really hoped it didn't rain...:
These are all the SE bits that needed to be removed from the new door. The new door came complete with glass, but needed the motor/regulator swapping over from my old door:
And the completed door ready to be refitted:
Unfortunately by the time we had fitted the new door, wiring, doorcard etc it was starting to get dark so the 'after' pic isn't great, but the colour match is really good and the car instantly looks loads better!:
The only remaining repair to do is the rear quarter dent you can see on the pic above, and a few small marks on the front wing. Hopefully I have knocked a few hundred quid off the repair job though, as they quoted me 4 hours labour just to repair the old door. The new one is as straight as an arrow. I might still get it painted again since they are already doing the front wing and rear quarter, but all in all i'm very happy with today's repair job!