I have a terrible time visualizing the "per square inch" model. At one point I did have a really nice link to a long armer and samples of what the per inch cost was next to what that translated into rough sizes. I've lost it and probably not appropriate to post here even if I did.
Anyway, this might be good for some of us:
https://www.apqs.com/pricing-your-lo...re-inch-model/
Maybe someone has a good chart to give us some rough idea or at least some of the right terms to use with the long arm artist.