Cool Lynch! Are you gonna do a step-by-step when you're done?
If I did it you know it's easy

, I got 5' pvc pipe 1" for $3 and change, the bottom caps are called nylon hole plugs but you can use any cap that fits, and the washers are 5/16 x 1 1/4.
I used the 1" ID pvc pipe so where I can fit the 18650 bat holder in there, befor I had a smaller pipe but wasn't able to fit the bat holder in it, but a water bottle cap fit on it perfect that was good.
The other batch I left white but this time I think I will try spray painting them but dont know if spray paint would work on pvc ?
Photo of older one.