Eddie, I put on 3 coats of epoxy after the glass so that the weave was invisible and completely filled. Then I knocked the shine off and put 3 coats of system 3 primer. Maybe overkill but as I recall it was per the manufacturer's recommendations. If your high build primer is two-part epoxy then maybe you'll be OK with skipping the weave filling coats, but I agree with Dave Wright on this especially on the bottom of the hull.
Same here ...3 coats of epoxy, very light sanding between coats to remove little nits, mosquitoes and bugs, and a bit of the ridges in the epoxy (shape of the glass) ...but without getting into the glass. 2 coats of a high build primer is fine, but a 3rd coat might be called for if any weave or scratches are still visible. Dave's boat has a very nice paint job....
If you want to minimize fairing, do your best job between the waterline and sheer, second best on outside of house and cuddy, and do an 'adequate' job on all other surfaces (basically just smooth out rough edges, sharp bits, etc).
Brian