Not much actually, though you may need some different tools than I used... .

LED Strips (Cheap on Amazon!)

A razor knife for stripping the "waterproof" coating from the lights,

Wire strippers for your contact wires and cutting the strips to size

14 gauge wire for the contact rings (I used 0 gauge. 10/10 do NOT recommend!)

a good soldering iron. (My Hakko 888D is GREAT!)

A router for cutting the aluminum (A bandsaw would be better but I use what I have)

1/8 inch thick Aluminum sheet (Found mine on the road after a scrap truck swerved to avoid my mailbox as it jumped out in front of him... You know how that happens.) My ring is approximately 18 inches in diameter with a 9 inch center opening and a 3 inch "tongue" in the center for camera mounting.

Double sided carpet seam tape. (You may love it... you may hate it. Keep some at hand at all times and things will stay stuck.) Find it at home improvement stores!

Eggcrate Found around the fluorescent fixtures at Lowes and Home Depot

Fluorescent diffusion material (I don't know what it's called but it is acrylic with pyramids on one side, about 1/8 inch thick) Found with the eggcrate

A scroll saw or band saw to cut the eggcrate and diffusion material

lots of wire. Thermostat wire works pretty well, I used some hookup wire that I got at a garage sale for $0.25

Flux for all copper to copper attachments

solder

Silicone sealant to help insulate any possible shorts. It's going to happen. Trust me.

Space to work and a decent vise for bending and holding the ring as you work on it.

1/2 inch tubing, I used air hose

8x 1/4 - 20 bolts with matching nuts and washers

drill and drill bits

wire

heatshrink

buck converter

That's a lot of stuff.... Not really, but it seems like it when you write it out!