Revisions 1 through 3 finished.
R1: Baseline
R2: Wide-mouth hangar
R3: Wide mouth hangar and more over all
R4: Reconfigured and remodelled
Revision 3 was envisaged to have a twin Phalanx set-up though I think that might be a bit much, other changes include a revised superstructure forward of the bridge which now houses a Mk22 with 12 Standards and 4 Harpoons. Rear superstructure has been modified too as well as the Mk29 replacing the original phalanx. It's again a wide-mouth hangar as opposed to the tunnel style set-up.
Revision 4 was envisaged with the ending of the cold war on re-focusing much of the ASW capability to a more general purpose or AAW orientated vessel, as such a number of modifications were proposed. A single helicopter hangar flanked by two 30-40mm weapons, two RAM launchers or gun based CIWS aft of the funnel, relocation of the torpedo tubes aft, modifications to permit SM-2MR usage. Failing any orders this would be the last proposal for the SC85 design to appear before the type was no longer promoted abroad.
~Regards, Mark.