Gosh yes, the blockbuster-method is the one that I've been using forever. When I was very, very young, and had very very poor drawing skills, I even drew up the whole Overworld map for the original Zelda (NES), took about 8 full sheets of paper, with grids and squares for every screen! And the best part about that was that I drew as much as I could from the manual, but the two upper corners were marked with question-marks, and so I had to fill them in as I went. Tough times for a little kid!
I actually just started restoring some half-good scans of a IoG-manual, so we'll have to see how it goes, and if it ends up well and somebody wants a copy, I'm perfectly fine with uploading it somewhere for personal use! (if anyone has hq pictures of the manuals, at least the covers, i'd appreciate them.)