Re: Davits aft
When at sea, be sure that the dinghy on davits has adequate opportunities to drain and is kept covered just the same. Should this fill up with heavy rain or become pooped by a sea, you could kiss all your boat performance good-bye (and possibly even the boat). Many are the tales of crews cutting the dinghy loose in a blow in order to save the ship.
The other more common caveat regards the added weight astern, in the exact worst place (other than in the forepeak) to add weight to any boat. Keep all the unnecessary stuff, oars, MOB gear, toys, etc., out of the dinghy. At best there should be nothing at all in the dink when it's on its davits.
The simplest design for davits will finish up being the most reliable, lightest in weight, and easiest to use. Again, avoid weight or complexity here. Having to climb around or under/over the arrangement might be the least of your worries. The cleverest plan will incorporate MOB gear, the mainsheet traveller, antennae and lifeline attachments in a simple, integrated, lightweight, ad-hoc design. Unfortunately so many boaties don't seem to think of this before adding complexity.