Error in kit: these little rudders near the propellers have posts but they didn't make holes for them to fit into. I cut off the posts and glued the parts on.

Lots of filing to get the propellers in nice shape. Set aside to be primed and then painted metallic bronze later. The instructions say to attach them now, but then there would be no way to prime and paint it nicely. When you're taking care with every part there are a lot of traps like that.

Disregard the instructions and glue the two top decks together. That way the hull is only top, left and right pieces.

The fill holes in the mold hit a few of the vent holes in the visible cutaway side of the sub. Filled them with putty. A few less holes but a much smoother look.

Two halves of hull RUBBERBANDED together, not glued. This makes it easier to glue the top deck two the back half of the hull: not the front facing side of the hull with the cutaway. After a while the rubberbands will be removed and the cutaway half of hull will be removed. Skipped over attaching ladders to the deck since the ladder might get painted green and the deck will be grey.

Looking into the cutaway. The deck is glued to ONLY the back half of the hull, the cutaway is just there to help hold it straight while it dries.