Parallel bracing is more commonly fitted to a thinner top which gives more projection and is perfect for that old rhythm guitar sound. Both of Jimmy Bruno's guitars are the standard width, as are all four of Ron Eschete's. Depending on the player, this varies. The 7-String neck is also shaped round. The wider neck still has a 12 inch radius, also very much the standard.
Standards also exist for body size and sound holes.
The first two 7-Strings I made for Howard Alden, however, have oval holes. The medium set, also popular, is .013 to .056, also with the .080. I've even made a few 7-Strings for myself over the years but sold them. I finally made myself another one that I play in my living room. If given the choice, I would make only that model.