Building a tank

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Hello All.

Recently recieved an HFS3 system from Jeff Howerton and I'm looking for a way to get a tank into my veheicle.

I will start with a straight water mixture and try a WM50. Tune for both and compare the results.

The tank will be mounted in the spare tire well in the rear of the car (FC3S) and will be about 3 gallons based on the amount of injectant I will need based on fuel consumption during track events (up to 8gals fuel during one session)

I'm having difficulty finding a suitable tank based on size constraints.

Next thought was to make one. I'm much better at welding AL than SS, but I've heard that meth is corrosive to AL.

I'm wondering if the WM50 is not. Or if there is one alloy that is more suited than others.

Any insight would be great. Or a 3 gallon tank that is less than 6" deep