@the_frog Thanks a lot!!
Here's an up-to-date pic with nw flags position, cables\antennas and a timeline of unit during war's years:
1) Neutral unit: civil livery, lightened windows and red\green signals, unarmed, red civil insigna. PRE WAR
2) Darkened unit: unlightened windows and signals, unarmed, again red insigna. FIRST MONTHS OF WAR
3) Converted AMC: grey livery, unlightened, heavy armed, different model with 2 funnels only, scout plane, island, added small command deck, different masts and pipes... white military insigna. FROM 1940