How thick is factory sheetmetal?

[team39763]

I wanted to know because I'm thinking of making my own rear rollpan.  I have a fiberglass rear pan from Mexico and I don't like the fit/finish.  For some reason I think I can do better.  I plan to get the correct gauge sheetmetal and have it welded by a pro.  I'm not worried about it looking good, I just need something better than what I got.
  So what thickness of metal should I ask for at the supply store?  Steel or something else?

[Captkaos]

18 - 20 gauge
We have them for $100 already, will it be cheaper than that to make them.
This is a pic of one on Jeff's truck:

[team39763]

I'll have to see what the metal will cost.  I'm really not trying to make it look good since the rest of the truck looks like crap, I just need something to go there and look like it belongs.  But you're probably right.  If I do buy one, I'll definately give you a call first.  Do you also have the front rollpans?

[Captkaos]

I have fronts for 81-87's