Puzzle 2 is now done! Puzzle 3 is a drawing (not text).
As we get to more complicated puzzles, it's clear that loading, rendering, and UI limitations will become a bigger and bigger issue. My colleague, Dan Maynes-Aminzade ("monzy" for short) is doing his best to figure out ways to handle that. There are a lot of not-ideal solutions.
It's also clear that more computer aided matching will be necessary to maintain progress. Here are zip files for the pieces of problem 4 and problem 5, if you want to try your hand at analyzing them directly.
Puzzle 4 pieces
Puzzle 5 pieces
If you come up with good ideas that work, post them in the comments.