That is a nice low center of gravity setup. I have a YJ but have often thought about building a TJ just like that (2.5 lift, belly up kit, and 33s). I don't think a 2.5 lift is enough for a YJ because the front shackles will make the approach angle too low but a TJ can get away with it, especially with a high clearance gas tank skid plate to improve the departure angle a bit.
With the belly up kit, do you find you can keep up with 4 inch lifted YJs with 33 inch tires just fine?