I love the Model F, but I do a lot of work with math, and having a dedicated number pad is fairly important. Is there any chance you’d consider a run of the F107, or some other expanded layout. A modernized version of the F122 would be neat (I do love having spare macro keys), especially if it had a metal case… since the “real” F122s had such brittle plastic tops.
Another option I’d love to see is an alternative stem that can take a Cherry MX keycap.
Sorry, I am focusing on the F62 and F77 keyboards which was the goal of this reproduction project. N.B. Making extra case molds for those other keyboards would add tens of thousands of dollars in costs.
I suggest the F77 in its dedicated number pad configuration layout (that’s the one I prefer too).