Floor Pan Help

Hi all,

I have an Australian Valiant Charger and am pretty sure that the drivers side (RHS) floorpan has some nasty rust. As this A-body is different to US A-bodies, the front right floor pan panel sells for USD275. Thats just the one side panel:
http://www.pentastarparts.com.au/sunshop/index.php?l=product_detail&p=3030

Then I also have to pay shipping and customs and VAT on top of that.
Is it possible to repair or fabricate my own panel???
Do these panels have to have the grooves in them or can it be 1mm sheeting?

HELP HELP HELP