If memory serves, there's a good bit of info on hard dinghy; stowing, towing, swamping prevention, etc., in Bruce Bingham's
The Sailor's Sketchbook.
A lot of the info on such, he Had to learn out of necessity, as he spent a good bit of time living on, & cruising a 20'
Pacific Seacraft.
Plus, there's a lot of other neat & useful info in it, along with drawn illustrations of such. Hence the book's name.
http://www.amazon.com/Sailors-Sketch...BF52KHQ88Z7SV0
Also, you might be able to shoehorn a nesting dink like the PT11
http://ptwatercraft.com/ptwatercraft/PT11Home.html , Danny Greene's Chameleon, or Dave Gerr's Nester onto your
boat, although it'd be tight. But with a little
work, the latter 2 dinks can be scaled down a bit, prior to building. Not so much with the PT11 as it's only a kit for now.
Plus, a "Spreader Bar" (perhaps not exactly the technically correct term) might make onloading, & offloading your dink a lot easier. Ditto on a well thought out lifting
bridle system.
PS: You needn't
rule out
davits just because your dink's longer than your boat's transom is wide. I'd think that it'd be doable so long as your dingy isn't longer than your boat's beam (length).