Ken,
Have a look at my request for information about installing a outboard in the rear locker you will find some helpful contacts and a couple of drawings.I think it's about five before your request for help.
If you actual do the job let me know I would like to have a look.
if possible or if you are going ahead we may be able to reduce the cost to both of us. As I'm still thinking of doing the conversion of it.
Another option MAY be to fit an internal Engine as I believe this can be done. could be interesting to look at the cost's of both.
My email is rayhowkinsATmeachers.com (work)
Ray