Thanks for the info Andy. I'm not too worried about that, just didn't want to overlook something basic that I should be looking out for.
Overall, I'm still fairly in the dark about geometry (I think I like steep seat and head tube angles, etc.), but, based on the feedback I've received here plus supplemental reading, I've got a much better sense now of the role that tubing choice plays as well as of the builder's role in making the final decision. I feel much more confident now about going into the consultation. Many thanks!