Thanks Hylandwoodcraft. I appreciate your thoughts. I definitely will be having a 3rd party engineering firm stamp the plans. I chose to size the timbers and solve for shear, deflection, etc. as part of my design exercise/process so I could get a feel for how a pro's decisions about the posts/tie beams/floor height are informed. Good suggestion too about deferring to each timber framer's personal style on the joinery as well. As an example, along the way, I opted for plates and common rafters instead of purlins to reduce some joinery. These are great suggestions. It helps me frame how I can approach a seasoned pro and use the right language to discuss buildability and design. Thanks a ton!