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Tubing follows the Birmingham Wire gage sometimes called the Stubs wire gauge as follows:

(Source: Aircraft Maintenance by Daniel J. Brimm, Jr. and H. Edward Boggess, 

Pitman Publishing Corporation, New York-Chicago, 1940.)

ga.    decimal

11     .120
12     .109
13     .095
14     .083
16     .065
18     .049
20     .035
22     .028
24     .022

The available thickness of sheet material doesn't match any offered by Dillsburg and AS&S.

I used the following for sheet steel:

ga.       decimal
11        .125
12        .100
13        .090
14        .080
16        .063
18        .050
20        .040
22        .032
24        .025