Currently using a Custom Origin (Tasha's CoE) Half Drow Rogue (Scout) 3 Armorer Artificer 5 with the Crossbow Expert feat. I want to make the maximum amount of attacks I can in the surprise round, which I believe is 3 (from the extra attack Armorers get at 5th level and as a bonus action from Crossbow Expert feat). I have a shield in my left arm, holding a hand crossbow on my right hand and the "gemlike node" for the Lightning Launcher is on the right hand of the armor.
Ex: My PC Kas wants to unleash a barrage of ranged attacks from cover to a distracted foe. He uses the Lightning Launcher with the first two attacks and finally uses the hand crossbow as a bonus action to finish off the volley.
Now it was never mentioned whether this node is on the palm side of the armored fist or the back of the hand, but only mentioned as either on your chest (like an Arc reactor from Ironman) or on the "armored fist". Personally I think it should be higher on the forearm like on a bracer or gauntlet part of the armor. Placing the node on the chest defeats the clause of the Crossbow Expert feat that needs a "one handed weapon" to be used to trigger using the hand crossbow as a bonus action. Also the Lightning Launcher is classified as a "simple ranged weapon".
Now being a "simple ranged weapon" on the "armored fist", does this qualify as a "one handed weapon" for the purpose of fulfilling the need to use a "one handed weapon" in order to use the hand crossbow as bonus action?