To remove the top deck, it's best if you have a spanner wrench.
Remove the screws on either end.
Carefully remove the cap on the rewind lever. Carefully remove the small screw that is to the right of it about 1 inch (2.5cm-3cm).
Carefully remove the cap on the film advance.
I say "carefully," because it's easy for the tool to slip and scratch the camera.
I can't recall if there is a threaded collar in the film advance. I think not. If there is, remove it. The top deck should now slip off easily.