I'm new at this tig welding but want to tackle this project anyway. I want to build a custom gas tank for the inside of the trunk of my '51 Hudson.

Questions:
1. Can I use sheet aluminum.

2. If so, what gage and what type (number)?

3. I read somewhere that just general driving stresses would cause the aluminum tank to eventually crack. Really? I thought welding aluminum would soften it rather than making it brittle.

4. Could I do a flange of about 1/4" around the ends and then place the end caps on the inside of these end flanges and then weld to the flange?

Peace,
chaz