First off, I am a fan of Bob's work. Many good designs with some I would consider IF I were in the market for a larger "go anywhere" boat. I know I can go into a marina and spot a BP boat quite easily.
I'm not so sure about how many BS boats have been built and sailed but some of the BS claims seem to be a bit far fetched. But, BS, at least you believe what you're saying. While steel built boats may have their place, they're not for everyone, especially for a DIY-build.
So, Brent Swain, This is for you...
I have built 38 , Evan built a similar number all are sailng,Ken Splett built a half dozen of mine, and many more in aluminium, Suzie built two. More people are now building their own, how many is anyone's guess, altho I keep getting more and more pictures of ones I have sold the plans for, which I have been unaware of having been built.
No, steel boats are not for everyone. For the majority of plastic boats, which spend their lives in marinas, only getting underway on rare occasions, plastic is the ideal material , as it will withstand years of abandonment. Bobs boats are mostly well suited to this kind of use, which is how most of them are used.
I have been meeting people who followed the advice to simply buy a used plastic boat , and I have been hearing the stories of the experience, including this morning. Rotted out bulkheads, rotted out floor, rotted out chainplate plate supports, electrics shot, all mostly due to he heavy condensation in such uninsulated boats, and deck leaks from bolted down fittings (as opposed to the super dry interior of an insulated steel boat, with all welded down deck gear, which never leaks) . They are dreaming of eventually upgrading to steel. The work they have to do to bring a plastic boat up to snuff and useable in a cold clime, is often far more than building a new hull and transferring the gear over. Maintenance of even a relatively small amount of varnish can be far more work that maintaining steel boat.
Steel is the ideal material for a DIY build. Many have built my boats from my plans, my book and Alex's video ,with few if any further questions. The have had all the info they needed. On metalboatsociety.com a guy just gave the quote for enough steel to build a 47 ft Van de Stadt hull and decks at roughly $8500. Ask any plastic boat builder how far that would get you in plastic.
Don't be afraid of metal working .It is very easy to learn, an very forgiving, as welds have 100% the strength of the material around them.. Unlike some materials, gaps are an advantage in penetration of welds. You don't have to wait for the glue( weld ) to dry.
Regardless of what material you build your hull out of, learning to do metal work will save you a fortune, and give you far better gear than commercially made stuff.
DIY building in fibreglass requires either a very expensive and time consuming female mold ,or a very expensive ,time consuming, hazardous to your health ,and very itchy , miserable amount of grinding, plus a huge amount of money for materials. Unlike steel it cant be done outside, drastically increasing the cost .
The picture looks more like sailing a Perry designed plastic boat at hull speed, on a dark, foggy night, with floating containers and unlit fishboats, or broken up log booms in the area.