This is a certainly a large project with some significant challenges to make it work with all wood joinery.

A couple of considerations:

1. Where is this to be built? What are the applicable snow and wind loads?

2. The two concentric rings of posts help in providing structure to resist the outward thrust of the central roof section.

3. A structure the size of the "inner ring" has eight sides of about 15 feet each. This is a reasonable span, but approaching the limits of all wood connections.

4. The outer ring will be about 26 ft to a side. You would need intermediate posts,giving 16 posts on the outside walls. The extra posts cut the span to 13 ft which is a more reasonable span.

Interesting project. I expect it's possible, but is not a small undertaking.