Tired, old eyes, and I might be missing it, but do you have vickers03's patch applied? See
Post 141 of Fleetboat Interior: Officers Quarters. FotRSU v1.2 has updated gun mounts in the upc file that we neglected for vickers03's mod (originally written for v1.001), hence that patch. Let me know please, if you were indeed missing that.
Edit: Also, for those doing extra mods, it would be best to put all of your "FotRSU 'Authorized' Mods" in the list first, those that come with the mod in the Extras folder. Then put the add-in mods that you are experimenting with, then do Vickers' interior 2nd to the last, and his patch last. Try to see and note which files are overwritten by the extra add-in mods. We know that the extra clickable items on the tracking table in FotRSU are overwritten by vickers' mod, but no loss there, other than convenience. However, his mod does have a upc file for each interior, so you need to apply his patch last then... That way, it's also easier to "see" any adverse effect from the "experimental" mods, or if they get overwritten. In other words
1. FotRSU
2. Patch
3. Extra FotRSU mods
4. Your extra mods - pay attention to what happens with them & what they over-write
5. Vickers Interior
6. Vickers Patch