After searching for past posts on ways to make facia I did not find much. I haven't played with archiforma much but I have found a very easy way (for me that is), using the roof tool. I can set the facia thickness and height, miter the inside and outside corners, set the facia square or plumb, level or raked, and the plumb cuts fit perfect too. I think its very clean and easy. Tell me if I'm trying to reinvent the wheel. I know that I'm limited to just a square profile this way, but it seems its a simple way to make facia within ac. Attached are a few boxes the I experimented on for all of the typical applications.
Thanks, Jim