Fix everything that a real estate inspector can see. If you're selling the place "as is," then you're going to get inspected. Inspected hard. Check with a real estate agent on what kind of value loss you should anticipate with "as is" terms and the extent of your unpermitted work. And check with a well worn real estate agent, not a shiny new one.
If the work is up to code, then you wouldn't have to tear any electrical or plumbing out. You would have to provide access, however, where maybe that's what you meant by "rip out all the work." The access may sound painful, but it sounds like you're already adept with drywall.
Time to invest in a rotozip if you don't already have one. Reuse the drywall that you remove if you can. If you can't get drywall pieces removed without breaking them, then draw straight lines on the wall to follow so that score-and-snapped drywall can patch things. They sell cans of orange peel texture at the hardware store, where using that stuff might be new to you.
MEPUninspected stuff behind the shower wall and behind the kitchenette could be especially difficult. If you're very confident in the kitchenette work, then an oscillating multitool cutting through the back of cabinets could be a good idea.
Looking at your electrical legalese, I see nothing about fines. You would have to hire somebody, though. See 3.203(5).
Looking at your plumbing legalese, there can be a fine. See 3.303(f)(4). I suspect that the fine is intended mostly for gas work which has been lumped together with plumbing. If you initiate remediation, I have a hard time imagining getting in any trouble, but I'm not a lawyer. You would also have to hire somebody to do the plumbing. See 3.301(d) (good luck parsing through (d)(2)).
In my city "as is" terms are no big deal. Homebuyers are irrational, but there may be a component due to the city's laxness about homeowners performing construction work on their own homes. Your county totally doesn't have this laxness, so the real estate market may punish "as is" terms far more harshly.