I picked up a used Kadet Senior Sport ARF a couple weeks ago that I'm going to setup with a Rimfire 55 motor that I had. The plane had originally been setup with glow power so the firewall has been coated with fuel proof paint, unfortunately the centerline marks on the firewall are covered with the paint. I ordered one of the electric motor boxes for the plane from Sig, can anyone tell me if the box just gets centered on the firewall or if there's a thrust line location I need to find before mounting the motor box?