I have a Willie with the side system and now I wouln't have it any other way. I also have a cut out for a motor on the tail. My rear pully is mounted on the side right at the tail. At first I wasn't sure about it, maybe it would fishtail or sit a little sideways but it dosen't it is just fine.

Go withe the side pully's there great the rope is easy to grab, it's not under foot, and you can get some back into it without leaving your seat to get right at your oars.

good luck