If you feel comfortable with it then designing from the outside in is okay. You will probably find out that the interpolated regular needs some corrections.

The other problem, however, is that during the process of making test printouts and modifying your font(s) you will probably end up making the “same” corrections to the bold and the light, especially when you are testing your regular, so you have double the work. This has happened to me and I have wasted lots of time. That is the only reason why I now tend to develop the regular first.

Why perverse?

Also, what happens with type is that you always have to make small adjustments.

I suggest that you work from a med to a bold or a bold to the med & then go to a light. The chances of the medium being really good based on the design that arrives from a interpolated light & bold seem small.

But to be fair I don’t know this per se. I haven’t done it yet myself. But type process are not direct - they always need tweakage.

I am sure other folks here can say more about it.

I’m well prepared for tweakage. The whole process is the tweekage of minutiae!

I only meant it was a bit perverse. I guess I mean that I would usually visualise the regular weight, as that’s probably both easier and the most used in a family. Designing the bold (as I’m currently doing) is fine, as I’ve already drawn it it all out on paper anyway, but I need to visualise the regular while I’m goin