Anyone mount battery UNDER, or flush in trunk?

It'll handle better. Wider and longer track for the rubber on the road. Bigger brakes. Once you start stripping it for "Race Duty" it will lighten up really good, but it is not to bad in strett trim ether. My Magnum has a listed weight of (IIRC) 3675. I dumpped a good 10 lbs. of electrical wire and started in on the engine iron parts for aluminum. I know you did fiberglass for the front bumper, but for those who do not have the stuff for fiberglass work... Take apart the front bumper and cut up the big steel beam behind the chrome bumper. HUGE weight savings! Same for the rear. You can drop a lot of weght out of these rides!
Yeah that front bumper with the brackets was damn near 100. I do plan on gutting the rear and just using the shell with custom brackets. No inner structure. Even the AC stuff on this car is ridiculous. The nose is 6 inches higher than it was when I started.
I haven't adjusted the bars or anything. That's all weight