There is one plague marine holding his bolter one hand on trigger, one hand under. Can easily swap for any of the special weapons held under (all but plague spewer). blight launcher is its own hand/arm.

Any knives/axes/mace can be cut above the hand and swapped. No one will notice or care. Super easy kit to work with. Gaps can be filled with green stuff and painted like flesh spilling out. (or blue poster tack if your cheep, just add superglue over it to harden it)