I plan to build a semi-custom .375, and am interested to hear if anyone knows or has used this company based in Fairbanks?

I never heard of them.
Do you have a web site address?

I just looked them up. The company is Artic Gunworks. The Owner is Gary Junk.

OK. I'm a dumba$$. "ARCTIC"

www.arcticgunworks.com

I would suggest you pop over here and join the forum and present the question in the Alaska shooting section.
http://forums.outdoorsdirectory.com/