I don't see why not. The stuff on the new ones is paper thin...like 14 gauge. You should be able to pick it up at Alro Steel and for a small charge they can shear it to your dimensions. Ask for a drop, otherwise you'll be buying a full sheet of the stuff. If you end up having to buy a full sheet, have them shear up as many as possible out of the sheet and sell them on e-bay-I'm sure there are folks out there who would buy them already cut to size.
You might consider a piece of 16 or 18 gauge stainless steel with a #4 finish on it...electropolished would be nice but very $$$.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.