Rylo's is a replica of a lightsaber that Elstree Props sold to a collector a few years ago. While it is pretty cool, there is some dispute about whether the Elstree Props saber was made for the production or not. A long article that dispute's its origin
here.
Elstree Props has sold several other lightsabers of metal. At least one of them also opens up - and it is different on the inside.
The lightsaber on
Parts of Star Wars is owned by Lucasfilm and has been shown in exhibitions. This is for sure the lightsaber that was seen in the close-up when Vader lights up Luke's lightsaber on Endor ... However ... The control box was modified after this scene was shot. The original control box had only brass brackets that held the covering circuit board flush to the control box. The modified control box has dark spacers under the brass brackets that lift them up -- supposedly to make the circuit board easier to slide.
The modified saber that has been seen in exhibitions is the one that has been replicated the most, both by fans and by official licensees.
The grip rings are somewhat uneven in width, but only a couple of fan-made replicas replicate that.
Unfortunately, that picture on PoSW is the only reference picture of the inside of the control box that I have found.
Personally, I would try to do the PoSW version, especially since I have a lightsabre with grip rings that replicate the unevenness of the original seen on screen.