I just finished side mounting my 1.50 in the ultimate. I did have to cut out the side and a hole in the top for the carb mixture and a hole in the bottom for the muffler. I used the stock muffler and cut a small piece out of the fire wall to give it enough relief to fit well. Its a 45 degree cut about the size of a 50 cent peice. Once the cut was made I used some fiberglass and epoxy and put 1 piece on both the inside and outside of the firewall. The mount doesn't look that bad from the front or the side. Those Chrome heads look good The only thing is the mixture adjustment is long and I had to cut a bigger hole than I would have liked to get the cowl to come off easy enough. Hope this helps. I like the side mount when starting it seems easier to get at the glow plug.
Jeff