I'm also in Appleton, and FWIW I have done all these things that you want to do to your JK, to my 04 TJ. And have the tools to do so. I can understand having the kit done professionally for warranty purposes and such, but no reason to pay shop prices to someone to bolt on a bumper.
Yeah, Kerstners kind of hit and miss. Sometimes he's a really cool guy, other times, well... A good resource to have though when your jeeps in peices and you dont have time to wait for UPS!
I'm just one fellow, friendly jeeper offering a helping hand. We're all in this together after all. If you're interested, drop me a PM.
BTW I could probably get that kit done with whats in my tool bag that I take on wheeling trips. Just sayin.