I have the original lightsaber fired from R2-D2 on the Sailbarge, it's the one used on April 23rd 1982 as they wrapped shooting on the location sailbarge set. It's used in both closeups, although the first closeup was shot later after the top of the saber received some damage from aborted shots. It's also the one shown flying through the air, though not of course the one Luke catches.
But more interesting from your point of view, I have the original gadget hero saber used (yes - used, & yes - original) on the lost shots of Luke in the cave building his saber and inserting it into R2's head in November that year.
I don't know if these items are of interest to you, or if you can include them in the project, but if you want to then you'd be welcome.
Mark, UK