I don't know if Roman's emitter cone will work. If I recall correctly, his last run emitters were slightly smaller than the Russrep. However, that might have changed if he's since redone them. The rest of his parts should be interchangeable with the Russrep because they're all taken from measurements of real parts.
You'll need the spacer/assembly adapter to hold them all together. Roman makes one that simply slides into place on a threaded rod and then you use the emitter cone and pommel as the "stoppers" so the parts don't slide off. (As seen in Roman's thread here.)
It's all pretty easy to figure out once you have the parts in hand. I personally created something like this:
This is a Roman spacer with two t-nuts on each end. This allowed for the saber to be easily field stripped like a real weapon, which I prefer.