How do you go about it as a potential mill customer?

[Tobus]

I've only done one custom mill run as an individual (others were co-ordinated through a kiltmaker). It was my experience that the larger mills prefer not to deal with individuals. If they'll even talk to you, their price will usually indicate that you should look elsewhere.

Have you talked to anyone at Andrew Elliot Ltd. or Prickly Thistle?