You're in San Diego? That's pretty much the best place (with all of SoCal) to find places to custom build one for you!
I suggest you gather some pics of bumpers on other vehicles that you want yours to look like, then look around for someone to fab it. Practically every other person in east county fabs in their garage, lol. I found someone out there to fab mine using craigslist.
IMO, it really wouldn't cost much more than if there was an aftermarket bumper available. Unless the aftermarket one was cosmetic only.