I tired a few things and ended up using a Rustoleum clear as the clear acrylic didn't want to stick to the polished aluminium very well. I started out with it highly polished, but, I ended up with something similar to the level of buff you have there. I think I could have made it shinier and the Rustoleum still would have stuck to it. You just have to really clean any polishing compounds off it before painting.
I drew my decal up in illustrator and the printed it on waterside paper that I got from these guys:
https://drdecalmrhyde.com.au
It's pretty easy, just make sure you get the right paper for your printer. I used a laser jet. It's not very dear and it arrived very quickly. Use the same clear to seal the decal after printing as you are going o use on the TRC and it will blend in nicely.
Build 1 - Shoegazer MK1 JMA-1
Build 2 - The Relliecaster TL-1
Build 3 - The Black Cherry SG AG-1
Build 4 - The Sonicaster TL-1ish
Build 5 - The Steampunker Bass YB-4
Build 6 - The Howling Gowing ST-1
"What I lack in talent I make up for with enthusiasm"