@chadconway you'd be competing with these guys for most extreme off road 3/Y!
It was a bit too extreme for me, but I'm interested to see what you end up doing!
The problem is the front upper knuckle limiting tire/wheel size, the five ways to ago about it are:
1. accept defeat and settle for either 255/55R18 or find a 17" that can clear the breaks and go super skinny with smidge more sidewall (dodging it)
2. use spacers to "dodge" it, can get slightly bigger than 255/55R18 (probably), might need to do some trimming though, this will ruin aerodynamics and range
3. get a portal axle bespoke built, off the shelf prices for cars that have them (mostly Mercedes wagons) can easily be north of $10k, can't even imagine what it would be to build a one off, it has some intresting play since it moves the axle from center of wheel to upper 1/3, so you gain more the bigger the wheel / less rubber you have, could probably fit 30" or even 32" tires this way, and if the gear ratio is done correctly it will even be accurate speed wise, not sure about energy loss to four portal axles, not sure if power steering can handle it, not sure about range loss due to added height (and the tires used) but this is the most "elegant" solution (if money is of no concern), also need to find a company willing to make such product, oh and portal axles use straight face gears that have the worse sound profile (which is why the Mercedes 4x4^2 is so loud if you ever stood next to one passing by at ~40mph or faster...)
4. Get someone like MPP to make 3rd party front upper knuckle (and maybe other parts of the suspension in order to accommodate the change)
5. Just get a Cybertruck, fits 35" wheels stock, might be able to fit even bigger, has like 17" ground clearance, off road mode, doesn't loss warranty when going off road, base model cost probably same as bespoke portal axle kit for Model Y haha