Did you fasten the seat to the uprights with plugged screw's?
I like how you dared to use arm spindles all different sizes. What method did you use to drill the holes for them (setting them out), it looks like the holes are stopped and not drilled right through? I temporily fix the chair arm in place with lath's, then drill the top arm one right through first, then drill into the seat with a long hand auger using the first hole to line up so they are in line. How did you cut the round tennon's. I just got a tennon cutter that goes on a brace, it works very fast and precise infinitely variable any where from 3/8 inch to 1 1/4 inch diam. I used to do them with draw knife and/or block plane but the cutter is way faster
I like shapes like that what you have made, not mundane like a bog standard 1950's teak park bench, but not airy fairy way out hippy pixie-forms either
Reminds me a bit of George Nakashima's table's and benches, adventurous and sensibly practical at the same time