i had a machinist friend of mine make the taper shaft to blade mount. he started with a ~5" diameter x ~4" long cylinder of ALU (6061 i think?), and cut the taper into it. then a 3/16" by 12" stainless disk mounts to the aluminum, then the blades, then a 1/8" x 12" disk of stainless sandwiches the blades into a supurb mount! 1/4" stainless bolts go through the front plate, through the back plate and into the ALU, while most of the bolts go through the front plate and are tapped into the back plate with an additional stainless nut, to be sure. very stout!
i told him, i want this blade mount to hold at 100mph winds, and that's what he gave me. his typical work is milling satellite lenses so if you're needing that, look up "gardner stussi" he's your guy.
sorry, had to give him a plug for his excellent work.
i lammed up the blades from clear fir, and fiberglassed them with 6oz cloth. painted too many times with epoxy ect.
enough about my machine, and more to questions: i created the tower clearance by tilting the head back by 4 degrees or so. i think i've got a foot off tower clearance, which some might not like, but by design of my blades, they really don't flex much!! and, it's only an 8.5' turbine...
i used the standard dan/hugh blade design. flat front, rounded leading edge, knife trailing edge, and thickest part 1/3 behind the leading edge. NACA something or other...
it's hard to get all your info from a forum, as many titles deviate into totally different things. just keep reading and you'll find answers! feel free to hit me up with a PM also!