Electronics are foreign to me too still, don't worry
Well A good way to start would be the core. Either make it a hollow tube or use something like a dowel inside of a tube for heft. Tube wise....chrome sink pipe....an old vacuum hose tube....even a generic Flash Gun could work. The pommel could be any metal bits you find in Home Depot or any hardware store that fit over the end. BTW part of this is creatively browsing hard ware stores and hobby shops for parts that aren't meant for this, but could be used for it.
Paint goes a long way, so finding or sculpting something to slide over the emitter end (which you could always cut beveled) and painting it would do the trick...See where I'm going with this? A bit of sheet wrapped around your main tube, or a pipe slightly larger for the clamp band....and any blocks / bits and bobs you find that look like the greeblies on this saber. It wouldn't be exact to the mil, but at the end, you've just created something and it feels worth a helluva lot more.
My only specific idea is for the little orange knob. Anything like a washer or top to a thumbtack that is round - you could cut 3 pieces out of it to make that shape
Keys for building sabers - a vice, lots of hand tools (files, saws, hobby knives, sandpaper) or a dremel, epoxy glue, super glue and/or epoxy putty like Oatey which can be sculpted, cut and sanded, and a large imagination! try to fit things together without glue first (like with nuts and bolts and washers) because glue can become brittle over time.
haha, did that help? search hardware sabers in this forum, you'll find lots. Tan Djarka is great with this sort of thing, I'm not
that talented, but I have a few things on here