I missed this when going over it the other day, might as well.
1. The RNG craftsmanship that is applied to all makeshift weapons, which usually dictates misfire and/or exploding in hand.
2. Unless the E-Pistol was shadily buffed since I last used it, it cannot even take someone down with it's full magazine, and you forget that to have potentially more, you would need to have access to R&D maximum cells. So, only a scientist who could make a better gun anyway or a very lucky cargo tech could make it.
3. The idea to make it is: Make the improvised handgun grip, add the curve pipe, saw it or hatchet it, then add more steel and weld, then add glass and screwdriver, add a battery, then a laser tripwire that you can print in a prolate/ask for from Cargo, and finally add wires and wrench to bolt it all in place.