As of October 20, Benny's Original Motor Works is open for business in Grand Theft Auto Online. There's a sick amount of customizations for lowrider-approved vehicles. Neon, sparks, graphics, engine mods, rims and wheels, sound systems, and, of course, hydraulics (so you can bounce and hit the three-wheel motion).
The video doesn't give us any first-person views of the interiors, but the customization is waiting there for you.