I don't have any close up pics of the tigercat, as my camera is crap......on a good day.
what I did to build the engine conversion involves lots and lots of putty, some plastic tubing and some lengths of sprue. I stuck some plastic card over the front opening of the original engine cowls, the stuck a short length of plastic pipeto the card, dead central, then glued some short lengths of sprue, round the pipe to bulk it out. The the tonnage of putty, begins. I built up the putty at an angle tothe end of the tube and the outer edge of the cowl. Then, I just let it go off and repeat until I started to get somewhere near the shape wanted. I then got an old screw that I cut the head off the screw, and put it into the back of the cowling where the prop goes in, then put this into my cordless drill.
I then set the drill going slowly and used a sanding block set at an angle and gently sanded the shape in. They needed more putty, as there were a few troughs here and there but they came out ok eventually. One thing to note is not to put any pressure on the engine as you are turning it as the heat generated can cause some nasty problems, just take your time with them.
The intakes are made from plastic tube cut at an angle and superglued on, and the exhausts are also very simple bits of smaller diameter plastic pipe, cut at an angle and sanded to fit.
Dead easy really.
Chris.