Like Steve, I cut my WJ at the pinch seam and used a duck bill and ball pein hammer to smooth it out. Your neighbours will be extremely delighted of course with the banging and clanging...
. Makes it even for the yappy little poodle..
Use a high quality cutter or nibbler to cut and water based duct sealant in the inner guards to water proof it.
Wheels have 4.5" backspacing. Flares are a combination of Bunnings garden edging screwed onto Bushwacker Flares.
Don't go to Pirate 4x4 as you will be lynched there.. lol!
Oh yeah, after all that, get it engineered to make it worth you time and efforts.