Added a WeBoost, and some dash mounts for a Garmin Mini InReach2 and my old ass GoPro hero 3. Mounted the WeBoost unit to a Mountains2Metal radio mount, in the clutch location.
The Amped Outdoors 30Ah Lithium Battery (LiFePO4) seems to come in a tall version - same foot print as the ones you used, but 2.24" taller. Wonder if those would fit in here with smaller conenctors than the Anderson ones you used, to squeeze 150ah in there.
Hmm, I've done Top of the World with a group of stock and barely modified first gen Ford Explorers. Of course, that was about twenty years ago now - but I'd think a base could handle it.