Just contact your local sheriff's office and have them issue you a VIN number and explain that its a new factory frame with no VIN. They have you fill out some paperwork, give you a VIN number to stamp in the frame, or a VIN tag that you have to attach to the frame somehow. Once that's done they come back and inspect it and give you another piece of paper stating its good, you take that paper to the DMV and they will issue you a title for it. It takes some time and some paperwork, but it can be done, and after that you will have a 100% legit, legal, titled frame.