Being a noob and all, Coop772 on YouTube has some pretty good basic mod guides (he has one for the Rayven) and does a lot of tutorials on more advanced junk like LED and rewring of electrics. Check him out on YouTube and I think he'll have some really insightful tips on what you're trying to achieve.
I know I'm bring this back but I was working on this when Double Rainbows were still popular. This is my Double Rainbow PAC. LDPE handle and barrel/Plungertube spacers, 1.5' bow arms on each side, Tee+45 elbow stock, 7.5" of draw, 1/2" PEX tube with nested wooden dowel rod plunger rod, Tee pumpgrip, Skirt seal. Hits suppa hard and is super smooth and easy draw due to the bow string being placed all the in the back of the blaster.