Yup, I'm just about to try the same thing. The bottom of my poly tank sits about 4" off the ground when I dump the air out of my bags. I'm leaning toward some heavy gauge (14 or 12) aluminum because 1) It's a little easier to work with and 2) I'm concerned about steel dragging on the ground and <maybe> sending out a shower of sparks 
No, I haven't got around to pricing it, but I'll bet it ain't cheap.....
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Rick Olson /nosto/
Galloway, NJ
Pics : http://community.webshots.com/user/nosto53
1972 Triumph TR6 - full resto, now with a Toyota 5-speed
1975 F**D F-100 - rusty, but reliable
1982 HD XLH-1000
1967 C-10, shortstep, 350/M21 4spd, nitrogen tank fills fast bags on 4 corners, Toyo 255/45X20s on American Eagle 221 20X8s, shaved locks and handles, antenna, fuel filler, tiny C-notch, rear fuel tank, long headers, Edelbrock, worn 600 Holley, Checkmate flush hard cover, rear pan, custom LED taillights - painted it, too! But don't like it so I'm gonna do it again!!
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