Which of those pics are your new found rep? You might label them, so the rest of us can follow you.
Depending on your skills, you may be able to successfully remove the crown guards (I assume those are the 'steps' you referred to), but the case is still too thick for a vintage (CG-less) Sub or GMT. Considering the condition of the case, a better (& more realistic) option would be to upgrade the dial/movement (assuming the original movement is not an ETA, which is a good movement), crown/tube (the tube is the threaded tube that screws into the side of the case onto which the crown screws down onto) & crystal with either genuine (gen) parts or better quality aftermarket parts.