First, I found a source for the square pins that I need to repair the wire in one of the Rotax fittings, so while we're waiting for that to show up, I started working on the cowling.
I traced all the scribe lines on the top and bottom, then, using a Dremel tool and a cutoff wheel, I started trimming. Parts of the bottom cowl don't get trimmed to the scribe line -- 1/8" off it -- and I catalogued all of the trimmed off pieces just as I did when building N614EF. You never know.
I don't know how people do this without a Dremel tool. I can keep sanding to a minimum by cutting very close to the scribe line. Had to buy some more cutting wheels but most of it is done; I still have a couple of cutouts to do in the bottom cowling.