This needs a topic of it's own now

I'm definitely going ahead with the idea now - cutting my old L series Touring Wagon in half, welding an A-frame to the back half and registering it legally as a trailer.
Got a professional opinion tonight and it's officially "not a completely stupid idea".
Better still, we should be able to bang it out in just a few days!
I've borrowed a larger angle grinder than my little 4" one and I'm going to start cutting on Sunday.