Welcome to the site! Aquasport inboards are rare, cool boats! But you might consider some interesting options - one of the most interesting I've heard was running a driveshaft to the rear, and putting a jet drive on the transom - that would be a really skinny water boat!
Whatever you decide, don't hesitate to post pics and ask questions on this site - someone here has probably done it - and you can learn from other's efforts!