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In this order
#1 Ti
#2 Stainless
#3 Al
Since Ti is probably out of the question, I suggest SS. It will not corrode or look shitty in 3 yrs like Al most likely will.
If you get the right guys to do it, it will be bullet proof and designed with P L E N T Y of strength, the structural difference between Al and Stainless is negligible in weight, because many grades of SS are twice as strong in most PSI/strength comparisons, the dia. of material can be reduced thus reducing the weight difference between the inferiority of Al in a marine, harsh environment
If you get the right shop to fabricate it, fitment is not an issue with whatever material you decide to go with, the quality of the fabricat-or is key.
This probably isnt something that can be done in your garage with a Sears craftsman stick welder plugged into your wifes dryer outlet, with a few of your bro's hanging out slugging budweiser and giving incorrect information.
The dude (owner I think) at Chingon down in San Diego somewhere is pretty damn good, a few years ago my neighbor took his boat from MDR/LA down to San Diego just because he wanted THEM to do it, lay day costs and all, they did a phenomenal job too....complete SS tower and replaced all the factory AL railing on his 2 yr old 72 Viking, plus a TON of other little stuff he wanted for his tastes....Needless to say, he was not a big fan of AL, but he could afford to be that way. He wouldve done it in Ti had it not been that brownish/greenish color... He likes shiny
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