Hi Chris,
I would advise you to first repair the hull and then have it shotblasted. This way the welded in bits have the same finish and you will not get rust on the hull while you are repairing it.
Do you already have a rear axle? You might want to ask this company here:
http://www.showroom.milweb.net/produ...3&item_id=3716 The name of the company is Groenewoud and they are located real close to me. If you want I can transport an axle and/or tracks to the UK for you. I recently aquired a Daimler Armoured Car I will be collecting early next year. Also bringing an UC axle for Kevin Powles then.
Cheers,