Why would it be untransferrable? While you can't build guns with the sole intention of selling them as a business without the right license, you can still sell a gun that you built for yourself and later decided you didn't want.
I see nothing about that shovel AK (so AWESOME) that would make it unsellable. You're not required to have serial numbers or anything on the gun.
BTW those are damn good groups for a shovel AK. Or really any AK for that matter.