He's a handsome fellow for sure!
Not BO/Red cross, though. That cross makes pretty much solid orange birds, sometimes with the black tips and tail, with white legs. They'd also be more rounded and fluffy like the Orp.
This guy has some barring or cuckoo in his background, you can see that on his saddle fathers. He's also got dominant white. When you look at him, mentally change the white to black, that's his actual base color I'm betting. Dominant white turns black "off" and makes it white, but the black can still be hiding underneath so to speak. He's a nice hefty guy, he could have some white Rock (which tend to carry dominant white that can mask barring),maybe some barred Rock?, and something Red in the background, along with who knows what else. Parent breeds were straight combed and yellow skinned, that's about as far as I can narrow things down.
He's really very pretty. I bet he'll make beautiful babies, you'd have a really unique flock.