A conclusion to my entries in the Fortnightly Topic Challenge #32: Grid Deduction Hybrids. This metapuzzle incorporates the three previous puzzles in this series:
I have received another envelope from my dear friend, this one somewhat larger. Alas, it also has no return address.
Inside the envelope were these two sheets:
Additionally, there were 5 square sheets of vellum:
And finally there was this one large sheet:
Wherever he is now, I hope he settles there until someone has a chance to catch up with him. Now it's just a matter of finding where he is.