[jacquesm]

Is aluminum an option for your structural loads? If so I would pick that before I'd even look at steel. Check out 6061 if that will work for you.

Here is a nice little article comparing two common marine grade aluminum alloys:

https://www.marinealu.com/a/marine-grade-aluminium-5083-vs-6...

[algo_trader]

thanks!!

So many helpful responses here.