Now its time to do the hardpoints for the control horns. Depending on exactly what you use this may be a little different for everyone. I used ZN horns, so I simply used the supplied 1/8" lite ply bases that get sunk into the surface.

I use a dremel tool with the router/depth control attachment to precisely mill out the correct slot for the hardpoint. Before I start I score the edges with a sharp razor blade in order to ensure a clean cut along the edges.

When the slots are all cut then glue in the hardpoints with poly-u, be sure to clamp them in place as close as possible to the surface to minimize sanding. Using balsa blocks helps to get things flush.

I basically randomly took pictures, but each surface is essentially the same process.