A 2 cycle diesel will run either direction. The cam does not have to be altered for it to run backwards, but I can see how it would need to be for optimum performance. However, if the
oil pump is a gear pump it will pump the wrong direction, when turning backwards.
Oil pump must be considered, but this thing may have electric motors running multiple
oil pumps. Also depending on the type of blower used, it may or may not push air, when turned backwards. The blower specs for this thing would be interesting in and of itself.
The 2 cycle diesels I was around had a very narrow rpm range for peak power output. It is a drawback in most applications, but when your only designing it to run 100 rpm, it wouldn't matter.