There are more pictures in this article that may help.
https://www.backyardchickens.com/articles/nest-boxes-why-do-we-make-a-sitting-hens-job-so-difficult.74389/
I don't I'm afraid and I don't live where it is anymore.
You should be able to make a guesstimate by looking at the scale compared to it's surroundings.
Something like this.
Features:
The coop roof lifts off. This allows you to reach in and access the hen.
The floor in the run and the coop is removable. Good for hygine and access to natural ground.
Build out of Marine Ply if you can. Fewer joints means less places of mites to hide.
I would use...