I'm currently modifying a Sig Seniorita to include ailerons. Given that this is a fairly slow flying aircraft, I'd like to make the ailerons as large as possible. The trailing edge is 1 1/8" wide. The ailerons I was thinking of adding are 1 1/4" wide and would extend 1/4" wider than the trailing edge. Would this create enough drag to be concerned about? Or would the pieces of trailing edge stock that I removed make decent ailerons for this aircraft?

Matt