You didn't say who makes it, what size, if it was covered, or if it's a balsa or foam kit. Do the directions say to hinge from the top? If so, this is building in differential, unusual in an aerobatic plane.
As you're using robarts, I'll assume it's an uncovered balsa plane. If it's a small plane ( below .40-size), you'll need the smallest robarts made. Robarts require a fair amount of good, rigid structure due to their diameter and length. Also, they require the most accuracy in drilling to prevent binding. I build a drill jig for that reason.
You'll need to bevel the leading edge of the surface. This is best done by placing the surface at the edge of a table and sand at a 45-degree angle with a sanding block or bar (the longer, the better). Another easy way to accomplish the bevel is to glue triangle stock to the leading edge.
Please post what this kit is and whether or not you have the build manual.