I actually found a guide for manual seatbelts but may just fab some type of harness bar somewhere. Headliner I decided I don’t care about that much, and the boot I took care of(:
If you’re not super concerned about the B and A pillar plastics, you can probably find a manual set of belts up in Canada, I shipped a set down to someone a few years ago, it would’ve been way cheaper if he didn’t want the plastic moldings and such.