I ended up scratch building some of the greeblies, such as the gold, hex stem base where the green hose runs from the control box to the tube below, and some of the hat lights/LED covers.
For the green hose stems, I took a mechanical pencil and found it was more or less the exact size I was looking for, as well as the shape. The plastic is very soft, so it was easy to cut two small pieces from it. I then used some leftover metal wire from the coat hanger I turned into my barrel extension switch to fashion a rod to attach them, and the green hose to. They are currently painted and ready to go, but I don't have any photos of them in gold yet.
They look really rough here, but they are smooth and shiny IRL.
For the hat lights, I have had no luck tracking any down that weren't crazy expensive for what I was looking to spend. One day, while working on the wand, my kids were playing with their Nerf guns and I got caught in the cross fire. When I picked up the dart and looked at it, I realized the tip looked kinda like a hat light. I measured it and it was pretty darn close, so I stole one for the tip of the wand.
I needed an opaque one for the body of the wand, so I used Play-Doh (don't judge me) to make a fast mold, and cast it in hot glue. Not the ideal solution, but I'm trying to use what I have on hand as much as possible and didn't want to buy resin for a hat light alone. The end result was pretty good and both fit perfectly. And don't worry, the yellow Play-Doh came off fine with water.
I used this same method to make another opaque cover using an LED lens I had that was the right shape/size, but not the right color. Here's a pic where you can see both pieces, and the resulting casts I made of them.
The last pics I have are for the wand tip. I took a plain acrylic tube and frosted the two bands myself using masking tape and 200+ grit sand paper. Measuring out those rings and where they hit was a nightmare, but thanks to Illustrator and some good reference images I was able to get in the right ball park (I think). If anyone wants those, let me know and I can provide as I couldn't find hard numbers on the wand tube anywhere.
In my research for the frosted bands I also found lots of pics showing the bulb that is visible inside the wand tip. I hacked up a dollar store flash light and stole the LED from it, which fit pretty much perfectly. The silver thrower tip covers the area where the bulb is mounted, so all you see is the bulb extending beneath the silver tip. I'm debating adding more in, because other opaque elements can be seen within the tube in ref photos, but I'm not sure if they would hamper my lights too much to be worth the effort.
Here's the hand sanded and beveled tube:
And here's the tube with the LED installed:
I also have some red electrical wire, and brown leather cord (to simulate brown electrical wire, that crap is expensive!) that I will run under the barrel and into the gun body per reference photos I've found. I'll take pics of those and post too, but I'm waiting on the heat shrink to come in for that bit before I can get it together.
At this point I pretty much have to get it painted so I can move forward.
Thanks for following along folks, I'll have more pics soon.