No sweat. All you have to do is decide how you want the engine mounted. They generally consider the typical mounting configuration and build them that way. The firewall is generally set up for the correct thrust angle so if you want to rotate the engine, well, all you have to do is re-set the engine mount on the firewall and go from there.

There is a posting somewhere here in the beginners forum about replacing the blind nuts and filling in the holes. I won't go through that because I just don't remember how the poster did it, but a little searching can lead you to what was recommended for filling the blind-nut holes. But, from what I remember, you can make plugs and epoxy them in place in the old holes, then place your new mounting position, marking the firewall for the blind nut center, drill out the hole, and pull in the blind nut.

Pulling in the blind nut, if you are not familiar with that, is an easy process where you drill out the hole to the diameter recommended for the diameter of blind nut you are using, then using a bolt with a washer, put the blind nut on the BACK side of the firewall, thread the bolt with the washer, and screw it in till the blind nut hits the firwall. Then you carefully and steadily, pull the blind nut into the hole. You can use a drop or so of epoxy on the blind nut to hold it in place.

The key part of this is to pull it fully until the backing plate on the blind nut is securely against the back of the firewall. The epoxy will hold it there (you don't need a lot of epoxy, just enough to coat the blind nut and not to much so it comes out of the front of the firewall (forms a lump so the engine mount is not square).

One little thing here. The firewall thickness should be more than the blind nut so it does not protrude out the front of the firewall. You can dry-run this before applying the epoxy so you are clearly assured that the blindnut does not protrude out the front of the firewall. If it does, you can always grind some of the blind nut so that it does not stick out. You want the firewall flat and flush so tha the engine mount does not slant one side or the other, you want it flat and flush with the firewall.

Oh my.. this gets sort of lengthly. But, you can most likely make sense of it and see what I mean as you look over what you are trying to do.

Let us know what you come up with. Pictures are always appreciated...

Later gater.

CGr.