Rajul, it looks off-center because the darn photographer was off-center. You can tell that by looking at the main gear. Actually, as shown, the engine mount is offset to the left 1/8" and has two thin washers on the bolts, giving the engine slight right thrust - probably around 1deg or so. The prop hub is only about 1/8" over to the right of the center thrustline.

I realize the chin tunnel was originally designed for airflow exhaust, but I'm think hiding the big*** 2stroke muffler is better than hiding the engine cylinder, especially since the TH .75 has that purdy purple anodized head.

The two cutouts I did on the sides of the chin tunnel make for convenient places to add glue to the backside of the firewall.