That’s the basics above. Stock, handguard, barrel length and profile, muzzle device, optics are all personal preference really. Don’t use any fancy low mass carrier or anything of that nature. As to what lower parts work best or what to watch on the AP lower - I’ll leave that for guys who have built Aero. I don’t have any input there. If you have any other details about the parts you have or what you want these builds to be, I’d throw it out there. You might get better responses if you share a little of what you think you want to end up with.
Also, I’d try to keep it to just one thread on this.