Looks really nice! I like the way they finished off the sides of the lean to....I'm going to copy that because it looks a lot cleaner, and I have enough steel left over. The translucent panels are a nice touch. We used something similar as the roof center, so the whole length of the building is a skylight.
Yours went up a lot faster than mine did, but I had to work around a lot of additional factors. I opted for a poured foundation and anchoring the poles to the top of that, and I also had to pour 1/3 of the concrete slab, because it's plumbed for a full bathroom, and radiant heat. There was already city water and a septic on the site, so that sort of dictated a lot of things (like building placement).
We have an ordnance limiting the eave height to 14' max (without a waiver), so I stayed under it....think it's actually 13' since the large door openings are 12' high. I really wanted to have 14' high doors, but it was just going to be too much trouble getting another waiver, etc. Mine is also 40x64 with a 12ft lean to off the back (guess that makes it sort of 54x64). I may extend it at some point, and I'd put a high lift rollup door on the end in case I want to park an RV inside.
This is what the skylight looks like:
I started out with a manufactured home on the lot, so we had to do demo first....made up a Photobucket album showing the process if anybody needs inspiration!
Barn Photos by G-ManBart | Photobucket