That's why the map helped big time! But had to get there first...so the exploration was mind-boggling everytime At least I think I got all those black & gold chests (at least I hope so) by the time I decided to continue to the finale
I also did the map first to get an overview of the place - at least as far as I could get without hitting a switch. But the more of the place I could see at once, the clearer it got.
Ah, it's not been that difficult. It's just a room with right angles. No landscape where you're blocked by rocks or trees or whatever. You basically just take a screenshot, then move on a little and take another screenshot and then paste them together in something like Photoshop or Gimp. It's much more difficult in landscapes and I admire those who have the patience to make maps of those.