Roof trusses for octagonal building

[Schkogen]

I'm working on trying to get the rafters right for two octagonal buildings connected by a straight building.



The roof slope on the octagons is 22.5 degrees. The straight section is ~24 degrees on the front side and 16.4 on the back. The rafter lengths are stated in the image.
The area of each "slice" is 2 m2.

The idea is to have a sedum roof, so the weight is 50 kg/m2 and I live in snow zone 1.5.

I have checked how the rafters look on gazebos, but they only have light roofs and no bottom chord or anything else. So, it didn’t feel very relevant.

If I could do anything, I would want a flat roof on the left octagon and open up to the peak in the straight section and the right octagon.

I've found an octagonal top fitting from a blacksmith, anyway, http://www.lovhults.com/toppbeslag.shtml

Some more images.
Rafters from above


Rafters from the side


Walls


Just put a bottom chord? A version of a W-rafter?
Is there anyone who knows their rafters and can give some good advice?

 

[huggan]

Oh how fun, it's my father who owns that company.

Snow zone 1.5 = 120kg per sqm.

Are you going to have insulation and interior cladding on the roof?

 

[Schkogen]

Haha, the world is quite small!

It will become isolated and panel in the ceiling.

 

[Schkogen]

No one has any good ideas?