This is the 6m version of the very popular Geodesic tunnel design I have subdivided a 2v dome to make a pseudo 4v framework then added the tunnel section in the middle.
The plans are still being refined but I''ve uploaded this design early because of popular demand. There are two door options: one in the middle of the tunnel and and end door at an angle, both are shown in the overview but you can build whichever you like. I will be building one of these myself soon so will be adding video tutorials when that is done, meanwhile if you have any issues while building this dome you can contact me and I''ll do my best to help out.