Wow, the amount of work that went into this is really incredible! Perspective -- oh wow, do I ever feel your pain. I don't know why it's so incredibly difficult, but I often have to do physical mock-ups (with cardboard and boxes and such) to get even the basic stuff right. You wouldn't think it would be so difficult considering that it's based on simple mathematic principles, but I've even sometimes caught myself doing it backwards -- that is, having things taper towards the viewer instead of away from them -- and then staring at the drawing going, "Why does that look wrong?" Anyway, thanks for sharing; I'm really impressed by all the work and the detail.

(This also reminds me that I need to stop procrastinating on my sgareversebang art, which seems to have stalled out at the preliminary sketch stage...)