I like the idea of a wiring/electrical upgrade. Two others are a Strut brace. I think Evan03 build has one. Yes, the XJ does not have struts. I did look at my '01. I wonder in tying it to the holes of the spring towers. Then extensions to the inner fenders.
Another one is you've had interest in COP ignition. I have looked into it. I looked at a Viper board, Honda boards and Stealth, Talon, Mitsubishi board. Basically from what I could cull is the 00-01 XJ is set up to an extent for this. The problem is the COPs might draw to much volts for the EMC. There was a discussion on the Stealth board on this and the Viper too. A guy going by Dragkita posted a wiring diagram on direct voltage to the coils, then using the EMC as the switch. Sort of like the headlight wiring upgrade.
Someday I might get to this. I think it would be easier to for you to do these, then I can copy. OK, easier for me.