I plan on making the seats sit as low as possible, cause I want to keep the top of the cage at least 4-6 inches lower than stock. I dont mind modifying the tub, as I'm cutting it up anyways to make a cab. Trying to fit a np435/205 combo is going to limit how much I can drop it though. I may clock the 205 some to help keep the belly flatter, but that will push it up under the driver seat.Burgin's YJ was probly one of the lowest i can recall: 3XYJ Build…Tons/42s/SUA= LOW.
Running spring sliders vs shackles might help package something super low.
If you really want to get low, and dont mind body mods, channeling the tub is where its at. There is alot of wasted space under the seats of a CJ/YJ/TJ. You can channel the tub down over the frame, or shorten the cowl area to be able to lower the seats.
For shackles I plan to hang them from the middle or top of the frame if that makes sense.
If I can make it fit, I actually want to move the front axle back an inch or 2. That way I can move the rear back even more without getting too long of a wheel base.