Here's one idea that I thought about for a bit. Give me some feedback on this one, please?
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To build a weapon via a construction kit, you usually need a number of parts, and over ten isn't uncommon. You also have to do a fair bit of shift-right-clicking.
What if.. the construction kit itself functioned like a 'bag' in the sense that it opened up a new area in the inventory like a normal bag, but with numbered slots where you could place the parts required to build the weapon, corresponding with the numbers of parts the building manual for the weapon suggests?
Every part would have to be checked upon being placed into the numbered slot, for being the correct type of part and having the minimum QL or above for the construction kit.
Upon placing the last part into the correct slot, the weapon construction kit would complete itself and turn into the correct weapon, considering the array of parts and QL.
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