Ground edges of spar cap to a smooth transition with dremel.
Finish sanded bottom Wing surface with 240g sanding block and Spar Cap with 80g.
Marked up edges of UND edge lines with a long piece of strapping brace as a ruler. Results seemed at variance with the plans, so made up a 'Swastika Square' from two carpenters squares joined by clecos, with the edges 38" apart, confiming the plans omit a couple of bits.
Marked up UND reinforcement areas, and those that will require peel ply. Filled the Wing bolt access hole with a bit of taped foam.
A bit later blundered into the wing tip and broke off a few inches. Glued it back on...