In my imagination I see a 2004 Pontiac concept that precedes the announced 2010 Holden based G8. Built from a AMT 2004 GTO.

Pickups or utes use doors the size of a four door cars.

I start by splitting the body.

Remove 5mm to the size of a four door.

I groove the door.

Glued in a half round for strength.

Cuts to weaken the "A" post.

Extend the body by 6mm and make up the 5mm from the doors totals 11mm panel..

Rotate the "A" post and roof up to height.

View of inside of finished up the cuts.

Temporarily reattach the  rear fenders. Notice front roof height ??.

Bed rails are just something to hang the fender on.

This will handy for some new concept.