I think you might run into problems. Code might dictate that you have nailing strips/protection. Steel covering the wires so that they don't get hit when you are nailing the SIPs in place. I'd probably make a bit of a groove in the back of the post (1/8"+/-) so that I could place a 3/4" conduit with sweeps on the ends. Then you could slide wires in after the SIPs are in place and before the drywall goes up.