Pablo, congratulations on your purchase! I'm so glad that 15% discount coupon worked - it must have saved you a bundle if you ordered two of these.
In regards to assembly, aside from that door defect, my one issue was with the cam nuts (or whatever they're called). The ones that came with that big ol' bookcase were weak - a couple even broke when I was tightening them up. I was able to purchase more at Home Depot for under $4, and they were much higher quality. If I had to do the whole thing over again, I would go to Home Depot first and buy the better connectors for the whole job. They worked much better, smoother and stronger.
Lophophoras, yes, they are adjustable. However rather than have the long lines of holes an inch or so close together the entire height of the bookshelf, each shelf "area" has 3 or 4 holes about 3 inches apart. I wanted a couple shelves in slightly different heights than designated, so I added some holes with my drill.
By the way, my new door apparently shipped yesterday. Finally!