still missing few pieces...
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the slots on the right wall are for crafted iconic weapons,
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The katanas:
One is from
Sandayu Oda or what was his name. it was a fight durring main misions.
The other one, a lot of people missed. it's in AV on the roof during The Heist mission.
Yeah you can place jackies gun there, also dexes.
next are Johnys gun, "Archangel" (i don't remeber where i got it though), Owervatch, shotgun called "Mox".
Looks like there is one spot for "Skippy".
and the last one (bottom left corner) i have no clue