Paul,
Indeed the Mega was/is a polarizing design. Many seem to object to the 'non classic' lines.
No worries, the numbers tell the tale.
Our Mega wasn't as 'pretty' as our 33 but was easier to sail and faster as long as you are not going tight to
windward in a chop. What seemed strange in 1978 is much more commonplace now (lifting bulb keel, powerful fractional rig, light weight, trailerable).
The rudder deal was the bracket that affixed the lower pintle to the the rudder case failed under pressure of high boat speed.
From the picture you posted showing your rudder case, the fix appears to have been installed. I will look for old photos that may show same.
I decided on the sail drive (Bukh 10hp) because when motoring in a swell the outboard would come out of the water and cavitate.
I selected the unit (much measuring to insure it would fit under the cockpit sole) but had pros install it. I wasn't about to cut the hole in the bottom.
It is positioned as far forward as possible and while heavier than the outboard, the weight is out of the stern and I am convinced it actually helps the sailing characteristics. Very quiet in its sound deadening enclosure and runs forever on 5 gal. of diesel.
What I have to do now is get it back!
Cam