Funny, I was drawing up fretboards (and necks) in fusion today too. 25.5 and 24.75... and got to thinking I should do a variation with Gibson's rule of 18 scale too. I need to find the math for it again (with bridge position).Now that I am getting more proficient with Fusion 360 I made myself some Rule of 18 fretboards on the CNC. Getting into 3D shapes now and had the CNC machine the 12" radius, as well as cut the fret slots and inlay cavities to match that radius. I also cut my own inlays from some pearloid sheet to match the inlay cavity.
Willing to cut more for sale if anyone is interested, just PM me. I will only cut them from EI rosewood fret board blanks I have. I also have some good holly veneer, nylon 6/6 material, and some good cream binding if you wanted to make a kit out of it with some of the smaller items you have to grab from multiple different suppliers.