allright, so you asked a huge, open ended question requiring someone else to do research, then got snitty when it wasn't handed to you on a platter. Everyone has spoken and you have your assignment. Honestly, i dont know of anyone here who has made a fanned neck. The only reason I know anything at all, albeit not a whole lot, is because i've played several basses and helped a friend research making his own. He gave up, as I said before.
Robert Novak holds the patent. He wants 75 bucks for the right to build it yourself as a licensing fee per instrument. Dingwalls are the only production instrument I know of that utilizes the FF system. A couple of boutique acoustic builders do it. You're going to have a hell of a time finding pickups to fit. as your pups will have to be angled just like the frets to get the same tone across all strings. and you'll have to spend a hell of a lot on individual bridge pieces. about 30-40 a pop times 8.
The consensus is this isn't an easy project and if this is your first build, run, don't walk, as far away from this as you can and build a regular instrument first. Reak all of novak's writing (novax guitars) and you can even pull up his patent and look at specs and stuff, but it's really as simple as laying out fret marks for one scale on one side, and the other scale on the opposite side and connecting the lines. All I'll say about figuring out neck width is use the standard formulas and design the neck taper around the longest scale length. when you're done you jsut trim the bottom to match the fret angle and make a custom nut for the top.
No one is trying to run you off or offend you, but most people here have gotten their knowledge the old fashioned way, by researching and studying.. not saying "i'm new, tell me how to do this" So that line will raise some hackles every single time.
good luck