I have to agree with Barb on this point of VERY deep under apron pleats.
On my kilts the deep and reverse pleats are deeper than normal but that is due to the fabric I work with. Poly/Cotton does not drape as well as Wool so I make my deep pleats DEEP. With Wool however, that drape very can cause problems.

I had the ability to experiment. I would build a kilt, try it on, and squat. If the apron did not drop between my legs I would cut it off and add a deeper pleat.
Then I would stand back up and see if the added depth caused the apron to hang funny when standing and walking. It was only these experiments (8-10 tries) that allowed me to come up with what works for my fabrics.

A Traditionally Styled and competently made kilt has worked fine for many men over many years. Most kiltmakers I know have looked at their work in action and tweeked their design till it works for them.

Yes, the kilt is still evolving. We, as kiltmakers, are still experimenting and trying to make our product better.

I hope that the kiltmaker you speak of was at least polite when saying they could not handle your request. I too have told potential customers that I was not willing to make what they are asking for. For example, I will not make a reverse Kingussie pleated kilt with a 7" apron.