I took a jump and decided to forget my worry about veneers on kits. But...I did only use light pressure when sanding.
I have hand sanded the body from 80 grit, 120 grit, 180 grit, cedar Timbermate, 240 grit, 320 grit, to 400 grit. Then it has had a serious wipe over with Wax and Grease remover, then a dust down with a tack rag.
Now three coats of Cabot's marine grade satin aerosol polyurethane ten minutes apart. I am liking the finish colours and tones in the wood. The binding has come out seriously good, no water based poly required as I did not use a stain.