Those of you fanboys who grew up on Star Blazers (i.e. Space Cruiser Yamato) should get a kick out of this video I found on YouTube Japan. It seems to be some sort of documentary on the mecha from the show, and it features a ton of technical drawings and pre-production art that looks amazing. Most of the stuff shown here is from the late 70s and the design work still holds up very well today - it's even more amazing to thing that all of that work was done without a single computer!
Here's part two which has more mecha and less interview:
And here's part three: