Well I was going to suggest that you Take the doors I have here for free, if you can collect...
But there is two issues with them.
1. they are Solar Red so would need painting (but figured free doors, so budget would poss cover spraying)
2. I have both front and I think drivers rear... so not the rear passenger like you need
Yours if you want them... also a bonnet and mk1 boot if your interested? Again both free as I'm giving them to the next scrap metal guy I see if not!