Ranga - thanks for the advice; especially on selection of epoxy. I couldn't help myself and had to open the ski up to take a look; I've seen too many issues with the boat to not want to take a peak inside. I'm glad I did, photos attached. Photos show foam block that is placed fore & aft of the rudder area as part of structure strength I guess.
My plan is:
1) drill out the old entry point in hull which is cracked.
2) some layers of glass on inside on deck and hull and a structure of sorts to secure the rudder tube and distribute the load and re-insert the original foam posts with some surfboard suncure foam.
3) close my eyes of expandable foam from earlier repair (not mine) as it's out of my reach.
then seal it all up again
Cheers.