Time marches on, computers die, and servers shut down, plus Photobutt ruined quite a bit of the internet back in 2017. So much of my original reference materials were long gone. Places like The Mad Modeler forum, LayItLow, and even Lowrider used to have some really great content on making these things more awesome.
Jevries website keeps getting changed up as years go by, here are some useful links to get an idea what's up.
https://www.jevries.com
https://www.jevries.com/rclowriders
Check out "Beswitched" and "Lost Angel" plus some "switch action'' for inspiration. There are several other guys building customs than just Jeroen, but it's easier to get ideas off these pics.