It's a ham project, you self-certify. Part 97 allows you to build your own equipment. Now, in doing so, you're also taking responsibility for your emissions, a

It's a ham project, you self-certify. Part 97 allows you to build your own equipment. Now, in doing so, you're also taking responsibility for your emissions, and you're expected to be diligent about making sure everything is within the rules. But there's no paperwork or anything unless you want there to be. (Taking notes about your spectral purity testing is probably a good idea, you'll probably never need them, but if someone complains it'll be nice to have.)