NiftyNicker's arch is constructed of Powder Coated Aluminum and is custom unit that is a one-off built as a class project in a Vocational School welding class.We donot have dinghy davits nor do we have a built-in motor hoist both of which I wish I had.The wind-genny has it's own mast partially guyed to the arch.My arch is too low in my opinion and I suggest at least 6' from deck to bottom of arch.
Depending on the weight of your outboard you can use the arch as a lift point but I have a Garhauer lifting davit for my 100lb. motor.
One other lesson I learned was to raise the radome much higher than your head
even standing on the seat to watch for lobster pots.I got a burn on my neck using the radar in fog ,in Maine, while standing on the seat.DUMB !I've since designed and built an offset to raise and move the radome forward.
The arch is an excellent solar panel mount and also for various antennas such as a wifi,GPS,or 2nd VHF .We use it for a canopy attachment and even lights and speakers for the cockpit.