Trawler..,
You have a great start.. with one of the best "off the shelf " 4x4's ever built.
".....and slowly building a off-road vehicle"
It already is..... specifically, what R-U going for here...?
Motor Mts. are cheap & easy.
Start with "safety"...steering, brakes, lights, electrical, fuel, ignition, etc.
With these areas up to standard....then personalizing can began & you'll have a better view as to what to do.
Keep in mind., major changes usually req. 2-3 other changes..., so be prepared & plan ahead.
"Any advice on where to start?"
For mods.., go to all the EB web sites...get there catalogs.., read about the changes & what parts are needed & other change/affects ea. has.
Fill-in your info. & Sig. page & ...that helps folks here help you...!
HTH
B