Thanks for your reply.
I have done some fibreglass work on my previous Hobie 16 hulls, rebuilding the bottom with woven glass and epoxy and it came out fine.
Guess I was looking for some encouragement as this looks to be more extensive and on closer inspection of photos appears the ground stake has gone right through both sides.
The other reason I am concerned as not sure if the area of this damage is structural in nature as it close to front pylon.
The crappy thing about this is that I bought this boat in June last year and only got to sail her once as a week later I broke two ribs in my back that put me out of action for rest of season.
Never ending drama!
Found an interesting article on fibreglass repair:
http://www.pbo.co.uk/expert-advice/repairing-holes-in-grp-26713