Yea after I learned how to make a milspec engine harness I think those guys are a joke. It isn't hard or cost half of what they charge to make it.It just takes time to study wire diagrams. I have made 99si harness a supra harness and about to start on one for my banshee.
But yea your setup looks very clean. You do have to send the ecu to get soildered if you running a version 1 but v2 is so easy to do yourself.