mm-hmm, and let's not forget about a long-travel, balanced driveshaft you'll need with flexy leaves (since your XJ doesn't have lockout hubs, so a square shaft is pretty much out of the question), the axle wrap, etc..
Since every kit performs differently, I won't go into how well a set of leaves work as compared to a good linked suspension, but just because they both hold the vehicle up doesn't mean they both work the same.
IF you're willing to fab all this leaf spring crap, why not make your own long arms, buy some used coils (like no one ever changes suspension), and make your own trac bar as well? Sure as hell would get you on the trail faster than cutting all that crap off the vehicle and axle, making new hangars, shackles, spring perches, etc...
The Thuren trac bar on my Dodge is nothing but a RE large joint and a poly bushing, and it's holding up very well under the 5000lbs that's on the front axle alone.
But I don't really get the whole 'beater build' thing anyway, so nevermind.