How to go about attaching two winches to the top of cabin. These winches
would be for spinnaker halyard and headsail halyard.

Do the winches come with a base plate? How do you attach the plate of
support for the winches? When the bolts, screws, or fasteners come through
the cabin top there is a ceiling liner under. Do the fasteners come right
through the liner? And then is there a back plate you attach to the inside
on the liner?

Also ,,, a block tack track. ? Attach?