Will,
Sorry for the delayed response. I wanted to check with the architect and engineer before answering your question about point loads. In all cases the point loads will be brought down to the foundation via interior posts (ganged 2x members). This is a method used successfully in the past by the timber frame contractor, Mitch Rowland (Architectural Timberworks), as shown in an article he wrote a couple of years ago for Fine Homebuilding.
Thanks again to you and Emmett for all your advice. I'll try to remember to post pictures of the final product.