Ranchero50 said:
A couple have done it, some succeed, some disappear. #-o
There's 4 people that I know of on this site. You, me, scubapro, and painlesstom.
I've seen a few on youtube, as well. Some of them weren't even aluminum hulls, they were done with fiberglass hulls, and even one with a custom built wood hull, it looked like a really nice boat (probably heavy, though) I've seen some that looked professional, and a few that were not so professional, quickly cobbled together, but still functional.
That's the thing, anybody can get lucky and build a boat that will run at least one time. Hell, mythbusters made a boat out of duct tape, and another one out of frozen paper, they both ran one time, too!
But building a boat that is durable, reliable, and will be functional for many years of useful enjoyment, is another story.
The 4 jet john builds I have seen on this site are most definitely what I would call professional, in that a lot of thought and planning, and time, went into the builds, they weren't just slapped together in a weekend.
It's too bad the 4 of us are spread out all over the country. If we were in the same area, and could pool our knowledge and resources together, I guarantee we could build some awesome boats. 8)