I'll re-post all drawing here:
The standard Fridtjof Nansen class, with added weapons:
Stretch Nansen class (60cm extra!)
Mk-1
a Mk-56 aft of the funnel.
Mk-2
Mk-56 replaced by two short Mk-41 VLS
added extra launcher for NSM. now up in 16 NSM launchers!
added third Mark 82 fire-control radar.
Mk-3
added walls, mounted on deck.
Mk-3B
Short wall version
40mm replaced by two millennium guns CIWS, in flank position, taking up space for 20mm machine guns.
Mk-4
bigger Hatch to RHIB bay.
secondary Hatch and overhang, for rep. operation. can also work as an secondary station for RHIB bay operation.