Don't know if this will help but I just replaced all the thru-hulls and added seacocks throughout on my '86 Legend 40. As follows:
Head overboard discharge (both), galley sink drain - 1 1/2"
Lav sink drain (both) - 1 1/4"
Raw water intake - 1"
Head intake (both), A/C intake, Seawater foot pump intake - 3/4"
If yours came originally (or has been modified) with proper seacocks and you are replacing/repairing/refurbishing, or just replacing the thru-hulls only, no problem. If yours (like mine) came originally with PVC ball valves and you are replacing/reusing them, again no problem. If you want to put seacocks in, beware that Hunter drilled the holes in the hull to accomodate the ball valves and there is not enough spacing between some of the thru-hulls for the seacocks. I had to use a mix of bronze and marlon and stagger them to make all fit (I really didn't feel like relocating all those holes int he hull!)
I have before/wip/finished pics if you want to see what I went through to do this.
Mark