Please take into account that the PT/ST didn’t exist when these scenes were created.
In ROTJ after Luke turns himself in on Endor, Vader admires his lightsaber saying “I see you have constructed a new lightsaber. Your training is complete” This would mean that constructing a lightsaber requires use of the Force:
The quote is "I see you have constructed a new lightsaber. Your skills are complete. ", not “your training”.