Tim, I don’t know what size tank you are thinking of but I would suggest that you think hard about the baffles and venting in the tank
Bad baffling will result in the fuel surging from front to back of the tank at speed and can have allsorts of funny effects
It is worth considering horizontal baffles as well as vertical ones
Venting is important to stop a partial vacuum while the tank is in use and the vent should be somewhere high (out of the water) and safe away from points of ignition.
Equally venting is important when filling the tank, make sure that if you have a higher spot in the tank than the filler neck that you vent this possibly back to the tank
Oh and incidentally aluminium does work harden but, depending on how it is used, it can take more time