I'm in a black hole of knowledgeable builders, so I can only speak of those whose work I have occasionally seen, or of those who have freely shared their knowledge. So, how about Jerry Huddleston? I have learned more from Jerry than almost anyone else. He is a wealth of information, and he isn't afraid to divulge gunmakers secrets to struggling new makers. His work ain't bad either.
Garry Brumfield has also freely shared his considerable knowledge.
Guy Montfort's descriptions of desirable attributes of various original guns, illustrated in the antique collecting forum, sure has influenced my understanding of what makes for really good architecture.
A number of other forum members have provided inspiration and influence, for different reasons.
Bill Shipman, for his crisp, clean work.
Eric Kettenburg for his ability to interpret the works of various builders, to create unique works of art.
And again, Jerry H. for his exquisite, high art work.
Haga's work, in addition to the work of Sheetz, Cole, Beck, Shroyer/Shreyer, and Creamer/Cramer , to name only a few, have provided their own inspiration and influence.