Dayum, now THAT is gonna be a tin boat, as in a boat loaded with tin!
Not to detract from your post of an excellent build, but I tell you, I'm VERY impressed with Steel-Flex! FWIW they also say one should only use a new/clean SS brush or rotary brush when cleaning aluminum. I've also had tremendous success using on on my 'old' boat with vinegar as the cleaning solution. It being a diluted acetic acid, it also etches the aluminum. Rinse well and if used inside the boat, I'd probable toss in some baking soda to make a solution/slurry to neutralize it. But I just rinse well when used on the bottom.
I did the SS brush w/ vinegar clean to 'bright' or as clean as I could reasonably get it (afterall, it's the bottom!), then the freshwater rinse, followed by good drying, then acid-etch zinc chromate spray primer, then Steel-Flex. Then I lightly sanded/solvent washed (removes amine blush) the Steel-Flex and applied a copper-free ablative anti-fouling paint, as my boat is moored 24/7 in saltwater from (hopefully) mid-May to the end of October.
I just pulled the boat and put it in my driveway, as I'll be away on vacation and this way I don't have to worry about it. After a few days of drying out, I gave my bottom paint and Steel-Flex'd hull a really good looking over. Man, that Steel-Flex stuff STICKS really well!
Just for kicks, in a area around a rivet, I used a new metal paint scraper just to see how well that S-Flex stuck. I had to really use some horsepower to intentionally gouge or scrape the S-Flex and at now time did any of it chip or break off. Appears to be wicked tough stuff! It will be interesting to see how it wears from year to year ...
NOTE - I sealed the rivets and chines only, I did not fully 'paint' or encapsulate the running hull in epoxy, nor do I see the need to. For one, I'm a cheap bazztard, LOL and I cannot see wasting good epoxy 'painting' a sound flat, solid, otherwise perfect surface in epoxy and even more, epoxies do not adhere with the same film adhesion tendency that say latex paints do, where the resultant finish is only as sound as the film skin is in a given area.
Anyway ... back to YOUR build - looks awesome =D> !