Yeah, I have a similiar strategyKnutselmaaster wrote:i will continue puzzling too now.
It sure is a hard one, with all those pieces of the same color!
But, i found a way to keep it understandable:
-In photoshop i group layers when i'm sure they stick together.
-I only add pieces to photoshop when i'm (almost) certain that i can place them.
-I have a "working directory" with all pieces, and remove the pieces that i added to photoshop.
-When i update the pieces in my puzzle directory in tm/skins/puzzle, i don't overwrite, that way i can easily find newly added pieces to copy to my "working directory" by sorting by date.
Hope it may help someone that is better in puzzling than me, my way to work may be efficient, but i'm very bad at puzzling, it will take me a year to finish

But maybe teamwork is the best? For example someone makes the edges, someone makes the cars, someone groups layers and so on.