Busy places take longer.
Quality takes longer.
"True" custom-making takes longer.
Care, craftsmanship, and skill take longer.

This goes for any business really.

As for the specific kilt companies, I wish that I could help you with that one. It might just be as simple as an email. All will usually answer the inquiries pretty fast.

I will be REAL interested in the KaberKilt when it arrives. You MIGHT just be the first reviewer on the site. With their "association", I think that the quality will be outstanding.