RockMonkey's build is sweet.
I have a Clayton setup tied to a pair of ruff stuff stiffiners.
I moved my charcoal canister to under the hood and actually used the one from my 87 Bronco it was smaller. But yeah the canister has to be moved.
On my 99, I was able to bend/relocate fuel and brake lines, I seem to remember the front upper was more of an issue for the lines. The Clayton kit hangs down pretty low, which was also nice for the np231/d300, I didn't have to try to push it through the floor board. I believe you will be building or having exhaust built too.
You will probably end up relocating the rear passenger side shock to behind the axle. Clayton has a nice little weld on bracket for that, I don't know if they sell it separately, or if you can get one from other companies.
You can look through my install pics on my build thread.
looks like suspension install starts around post #12.
https://www.rme4x4.com/threads/nathan-and-tanjas-99-xj-build-up.83436/
(big purple xj... Lehi... Ben?...)
Nathan