Hi Nick.... I spent 1405 days
supervising fault finding, maintenance & refit on GMLS13 launchers for our HMA vessels
The larger rectangular plate/round door is [personal ] access to the machinary space which is circled by the outer magazine = two concentric circles of cells [16 + 24] in which the missiles sit naturally in the vertical plane ...
The magazine is accessed by the round door FWD on an FFG as shown in your image ......was a bit scary on my first entry [1987] to a live magazie filled with white domed birds [Harpoon missles]
The actual blast door is located between the two 'A' supports for the Guide Arm - this is located directly below the guide arm when the guide arm is in the vertical plane
The missiles are loaded from an along side lighter/amo barge via a dolly then to the guide arm 'rail' in the horizontal plane, then the arm elevates to the vertical plane & the missile down loaded into a cell
When you get to the painting stage...follow these simple representation/points
'A' Frames & Guide Arm = normal superstructure colored enamel
Arm Rail = flat molybond [dark gray colored] steel
Actual Blast door and circular ring of the Launcer that the A Frames mount on = Molybond [dark gray] color enamel with fine sand added to represent the high temperature ablative finsih
Major diameter of the magazine proper top surface & down to the full ring magazine retaining bolts [132 x 1 1/4"UNEF from memory
] = Molybond [dark gray] color enamel
without fine sand
Your representation is very good
..is it a kit or sctratch built?........Derek