My guess is any of the plastic aftermarket cowling sets are going to be pretty good, because they are cast in injection molds, so there is very good control over the integrity of the hole spacing and such.
Unless the company is not good at making the original molds.
I have the same kind of carbon fiber as Slow had, most of it from MDI. They got the mounting pillars so far off on one of the two tail pieces (which the rear turnsignals mount in) that I had to cut the pillars out and screw them to the turnsignals, put some epoxy on the ends of the pillars, and fit the turnsignals to the piece. Then I put a wood block on the inside (turnsignals mount from the inside) and wrapped masking tape around it tightly. After the epoxy dried, I unbolted the turnsignal, leaving the pillars in the right place.
I still had to spread epoxy on carbon fiber tape and wrap the bases of the pillars; epoxy, tape, epoxy, tape, epoxy, on all three of them.
It came out looking just fine, but I had to do a lot of work.
On my large side panels, which hold the front turnsignals, the cutouts were way off, so I had to use a dremel and redimension the cutouts. One turned out good, the other has a minor miscut, not obvious, but I know its there.
Getting the headlamp assembly in the top cowl was not easy, but turned out good. I had to dremel the openings until the headlamp covers would just barely stick out, and then found the two bottom pillars that the bottom of the headlamp frame bolt too were like 1/2" too long, so I had to cut them down. They make them out of steel tubes imbedded in plastic tubes, wrapped with carbon fiber and expoxy. So just cutting them shorter was tricky.
Fitting the mirrors through the cowling into the brackets was a nightmare, the wholes in the cowling were 1/2-3/4" off both sides. So I had to slot one hole and drill a new hole on each side, and then had to plug the forward unused hole on each side with carbon fiber tape and expoxy.
So I'd say the abs aftermarket plastic cowling sold on ebay is probably a better bet. The two guys I found selling a wide variety of pieces both have good feedback scores, and none of the negative feedback was about fit or finish.
Living the Gypsy Life