The Quick windlass we installed is a horizontal windlass. I think that there were two fairlead angles to consider, both from the anchor roller to the gypsy. The horizontal angle we got correctly. I didn't sufficiently consider the vertical angle and mounted the windlass as high as could on 1" starboard marine lumber, and chain still came down at a slight but noticeable angle to the gypsy. I think I should have fabricated a deck block that was higher in the front than in the back for a perfect fairlead. I could still make that correction, but I haven't yet.
I don't have pictures of the windlass installed. Here is a picture of the anchor locker before installation. Not shown is the repositioned cleat. I could try to take and post some pictures later.
http://i742.photobucket.com/albums/xx61/Tejasdave/AnchorLocker2_zps482e309a.jpg
In addition to the the stainless steel backing plate, I also replaced the short narrow stainless steel chaff bar with full length stainless steel plate.
Another installation consideration was routing the wiring into the anchor well. The wiring enters the bottom of the anchor locker from below the forward berth. To avoid water running into the bilge, the wiring is run through a through-hull and then through tubing up the windlass.
Also installed are two remote outlets, one in the locker and the other at the helm.
For drilling the mounting holes and the hole for wiring, I made a hardwood drill-guide jig that I clamped onto the shelf. The jig was also useful for fabricating the backing plate.
One almost disaster was that to be able to remove or replace the windlass cover, the windlass needed to be mounted further forward than I had initially planned. The installation specifications did not mention this and the discovery was serendipitious.