Ok..
The objective is NOT the low rider look.
The objective is the low sports car/ racer look.
The front spindles lower the front without changing suspension travel, trailing arm angles, or the overall geometry of the front. An increase in scrub radius, but that is gonna happen with wider wheels anyway. Just add the offset bushings so you can move the camber from a couple degrees positive to a couple degrees negative and possibly a heavier sway bay.......and you have hard cornering geometry.
So for the back end......yes it is "normal" to just squat the rear suspension down, even remove or use short rubber bottom out stops. But it kills the handling. You would be much better off just leaving it near stock.....just letting down a spline tooth or so until you get to one degree negative camber.
Hard racers drop the back down with lots of bracketry. Engine and trans raise, offset trailing arms....all kinds of stuff to avoid the squatted low rider handling.
I have no body limits....I am willing to cut the body or whatever. So the current plan is to move the entire rear suspension and its geometry to where I want it to be. Thus avoiding the handling complications involved in squatting it down.
It may not actually work out that way.......but the math fits.