I have been out of the 3dr game for some time and they have rocketed in the last few years as well.

I imagine the donor car will be in decent shape its been dry stored since 2004 after the accident?

If its not recorded then at a rough guess £20k plus

Most people don't stamp the shell, just transfer the VIN tag in the engine bay and keep the floor blank, plus cut out the floor numbers from the old shell as proof it no longer exists.