the frame that is on that bike like i said is one that everyone raves about. the dyna fram was redesigned in the late 90's, and HD actually did a couple of special vehicle ops runs. i think those were badged as fxr2, and fxr3. as for making it fit, I had a friend who was 4 ft 11 in tall and she got that frame to fit her. the convertable is a model that harley has. they came with a windshield and saddle bags from the factory and could easily be removed. it was called a convertible since it would convert from a touring model to a cruiser model with little effort.
as far as long trips go, the HD motor is pretty bullet proof, and dirt simple to work on. i am sure that if you take care of that shovel head motor it will take care of you. i dont have a shovel head motor on my bike, I have an early fathead (aka twin cam 8

and I did 5600 miles on that in 13 days without a problem. i now have about 58k on the motor and it is still solid and all i have ever done is oil changes. no major motorwork has been necessary
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I have a poodle seeking missle, and I am not afraid to use it!