Framing a 45'x55' span - materials?

Trying to determine how to frame south facing wall/roof on a Walipini. (Glazing wall) Depending on the final decision on angle/pitch, it could be as much as 45' vertical. I can make room inside for posts if needed. The glazing more than likely will be double walled polycarbonate, so fairly light weight. The walls will be earth bag construction to 8' high. North side will need to go up to 25' higher than this. I am thinking of wood framing this part. North side will be bermed as much as I can. The east/west walls will be wood framed above ground and will probably have the polycarbonate siding.
I am not familiar with building materials that can span 45' (vertical) without support, without costing an arm & leg.
Any suggestions? Not looking to be on the cover of Home & Garden, so not concerned too much on looks. Just want it structurally sound.

Open to any suggestions.

Thanks!
Jim

Could you post a picture of the site to give us some ideas.
Since I am in metric these days are you talking 45 foot ?

David

David,

Yes I mean 45 feet vertical and 55 feet wide. We are still in the excavation stage and have not started to build yet.