In your picture, has the screw on the left been shortened?
No, It would impossible or hart to assemble seat or adjust seat angle.
I removed my first seat post tube fom mold on morning today. It weights 74g/280mm. It's taper wall on lenght and rotational dimensions.
It's just for sample post and I'm getting better materials for it in next week.
Since ti mtb version is 143g/330mm, this road 280mm version should be easilly under 90g. (calculated to be 75g but I'm not sayin that, yet.) First one will be 95-98g for start.