I have seen a LOT of ZJ builds, and built a few myself. VERY impressive build, you should certainly be proud of what you've done. My ZJ currently is on long arms and 35's, and is used for a combination of some harder rock crawling and towing an M416 for the expedition type stuff. I am on the lookout for another ZJ as my unibody is pretty much shot. Even with the lighter wheeling this is something that will show up eventually, I think Ted Z pointed out some of the rear bumper issues earlier in this thread. Also, another area of issue to keep an eye on is your short arm suspension system. The mounts are notorious for peeling off of the unibody, resulting in a very undesirable scenario! If you haven't already, I would start looking into long arm systems. Yes they absolutely perform better and are designed a bit more for the more technical trails, but the main reason I upgraded to long arms was dependability and not having to worry about my control arms mounting to the weak unibody. My preference is Clayton's long arms, and they include a rail that runs between the front and rear mounting points to distribute the load across the unibody. On my next ZJ, I will use Clayton's again, but strengthen the unibody from bumper to bumper to hopefully avoid this issue.
And I know it has been brought before as well, but you really need to make it to Grand Slam West! Next year will be the 18th year we've had the event. There is a lot of the harder trails offered, but still plenty that you would feel more than comfortable taking your ZJ on.