If I ordered a bunch of parts for a complete custom MHS saber, would they all come in their separate pieces or would UltraSabers put it together and then ship it? I ask because I'm utterly hopeless with circuitry and other electronic stuff like that, and am worried I'd botch the construction of my saber.
If you ordered a bunch of MHS parts for a complete custom saber you would not be ordering from Ultrasabers. MHS parts for a real modular saber come from TCSS. Ultrasabers sells MHS compatible parts that have the same threading but are imperfectly matched in other ways. You can order a bunch of MHS compatible parts to mix and match but you will need to make sure if the body and emitter you use match with the MLS lighting unit or the standard 1 inch one and how it will mount.
Also US does not offer any modular wiring/ plug n play solutions for the electronics needed.
And as stated if you order part by part US will ship them unassembled.