I tried various types of scissors/snips when practicing and they all left the metal with some amount of curling to it. Not what you want in a flat flap. A heavy duty paper cutter did the trick nicely. Then used a Dremel tool with various cut-off wheels and grinding bits to radius the corners, and smooth edges where necessary with files. Used the same hole punch as MT45 above, and finally the Pintonka tool for rivets. This was my first attempt at a replacement ramp & flaps ever. Just work slowly and carefully, measure twice before cutting or drilling anything, and it'll come out fine.
Oh yeah, two tips: make sure the grain of your blue dye & steel is facing the direction you want, otherwise you may find it annoying once it's cut. And, before riveting anything underneath a clear ramp, make sure to clean out all dust between the surfaces, or you'll see it trapped there forever.
