I went back to the drawing board and created a memory box that is 10 inches square by 3 inches deep.  This gives me plenty of room to add additional pictures, maybe in a thicker envelope insert, as well as additional inserts, cut-aparts or other memories around whatever occasion it's used for.
I'm still struggling with paper breakage.  It happens at 65, 80 and 110 lb. weight and whether I use glue or tape.  I've tried soft scoring, deep scoring, soft folding, aggressive folders, it just doesn't seem to help.  So this was my only major issue this time.
As per usual for me, I probably added too much between the acetate for the cover but I'm ok with it.  I consider it not too bad for my second go at a box like this but definitely need to work on construction and decoration.
These inserts are just adorable.  Can't wait to add some winter memories to the box.