Thank you all for the feedback. I'm by no means an official designer, but after a year of studying other plans, touring Parade of Homes, a full-on addition to Houzz, and a 2nd full-time career trying to figure out Home Designer Pro, I feel pretty good about the design. But where my confidence stops short is overcoming important components like a roof that doesn't leak and ensuring the structure is safe and meets code. A couple of resources have emerged through my question here that I will interview with the plan in hand to see if they can provide the needed professional assistance. I do appreciate the quick and candid follow up to this post!