Listen, it's not just "wiring and harness changes in addition to what Jason did".
We're talking about a completely new hardware suit, carefully integrated into the vehicles chassis, wiring harnesses, cooling and software systems - NOT designed for retrofit ease.
So I imagine that
firstly, you'll need to spend several hours - if not days or weeks- to study the vehicles wiring diagrams and parts manuals. Of course, you will need to order all your new HW, that is at least your cameras, parking sensors, wiring harnesses, AP2.0-ECU +++
Secondly, you'll need some hours (if not days or weeks) figuring out how the HW changes will relate to SW changes. What updates etc, are necessary?
Thirdly, all the existing AP1.0 hw needs to be dismantled. That's - at least - the windshield (complete with the MobilEye camera), the front bumper panel, side and back panels (for the parking sensors and side repeater cameras), ALL the main bundles of wiring harnesses running tough the car, plus the rear view camera. The wiring dismantling process alone should take quite a long time. Remember, to access all the necessary wire harnesses, you'll need to open a whole lot of "none-AP1.0-related" trim garnish and so forth.
Ok, fourth: You might need to do some structural changes to the aluminium body itself. I'm mainly talking about the B-pillars: I'm pretty sure the exact location of those new cams weren't thought of when the old cars were manufactured. But don't expect there to be no other necessary "hard hardware" changes to the car. Maybe you'll need to drill some new holes, attach some new brackets etc,
Fifth: Only now you're ready to start putting in the new AP2.0 HW in your car. I bet this isn't done in a day.
Sixth: Replace broken panel clips etc., and seal the car back up.
Seventh: What's the point of all this new hardware, if it's not (A) properly calibrated, and (B) properly flashed with current firmware and the whole car updated with newb hardware codes, so that any new OTA SW-bundle targets your car as an AP2.0' and not AP1.0 vehicle.
@wk057 wrote he did the non-AP-to-AP1-upgrade for "less than $ 9000" - not including labor. That's a one camera, one radar and 12 ultrasonics upgrade. Let me see you do the upgrade to AP2.0 for anything less than twice than this - plus labor - and I'll be hands down very impressed.
Good luck