After I found the correct position for the mounting, (took awhile trying to center that prop shaft just right in the center of the cowling), I marked and drilled pilot holes. Once satisfied that this was my final configuration, I picked up a few 8-32 socket head bolts, (1") and matching blind nuts, (or T-nuts as they are also known). I then re-drilled the 4 pilot holes large enough to accept the sleeves of the blind nuts. Don't laugh but then I simply dropped the blind nuts down into the nose from inside the wing saddle. I used a long screwdriver to flip them around and to get them temporarily seated in their holes. I did this one at a time. I then slowly inserted one bolt at a time and torqued them down, permanently seating the nuts. Then a dripped thickened CA around the edges of the nuts,(careful not to get any inside the threads) then hit it with activator. DONE!
Make sure you use washers behind the bolts to keep them from digging into the firewall. The washers will allow you to really tighten them down to get a good seating on the blind nuts.
Believe it or not, this worked extremely well and makes a solid mounting.
I had to trim the cowling using my Dremel grinder wheel along the bottom and lower sides to get a centered prop shaft. Once I had the engine bolted up, I simply moved the cowling around a bit until I hit center on the shaft and them I drilled the mounting holes and bolted the cowling in place. Sounds difficult but it wan't hard, just time consuming.

Anything I else I can help with, just ask!

Point Magu