Not lightsaber specific, but I'd like to see a way to break down larger weapons into a number of Encumbrance 1 components that require a number of Maneuvers equal to the weapon's real Encumbrance to reassemble (so 3 maneuvers for a carbine or 4 maneuvers for a rifle).
I dunno if you'd really need that many maneuvers. After all, this is a game about playing imaginary space travelers in an imaginary setting where the laws of physics are pretty much overlooked in terms of "is it cool or not?" Not that a couple posters in this thread seem to comprehend that particular point about the franchise and insist on "realism!", but that's their malfunction.
If anything, I'd say that having it require the character's action (especially in combat) to reassemble the weapon would be a sufficient drawback in exchange for increasing the difficultly of Perception checks to notice the weapon twice. Out of combat, a round can vary wildly, so even a single action could represent several minutes' worth of careful assembly.
Or perhaps require two actions to assemble if in combat, with the chance that with a successful Mechanics check (at least Average difficulty) to assemble the weapon in a single action (be a good time to add a setback die or two to the Mechanics check as well). If the check fails, then the PC has already spent one action in trying to assemble the weapon and just needs to spend one more to finish the job on their next turn.
And unless you're splitting the components up amidst multiple people or stashing them in multiple places that aren't on your person, the Encumbrance reduction is largely a moot point. There's no real difference between carrying a single Encumbrance 4 blaster rifle and four Encumbrance 1 parts of a blaster rifle. But even then that's probably more of a narrative thing than an element that needs specific rules to handle.
Edited by Donovan Morningfire