Is that required or just desired? I've been watching this guy's post-frame youtube work for a long time and it doesn't seem there's much 'engineering' to that building method. Beyond the proper roof trusses, which are sitting atop the posts (anyway). Seems to be a very straightforward process.
He puts a lot of details out about the various aspects and he seems a helpful fellow, maybe he could refer you to someone closer to you. RR is in Illinois.
Yea I'm very familiar with RR great video's. Which I'm planning on doing myself, but it doesn't hurt to have detailed plans. I'm not required to have them.