Hi,
Nice project, we just live once ! but now to make it into profit ... You'll have to think of what products you'll want to make and sell.
Pawpaws, I heard, are hardly shippable, the fruit is not easy to transport if fresh. So are you thinking jams or preserves ? If so, think of the costs for the building for hosting that activity and "pans"/big cookers in fact, and what you need for the jam (sugar, jars, lemon juice? , agar agar?... ) and marketing or time so sell at a farmer-market.
The same for the other fruits. But ok, that's a long term thought that you need to have, but can have later. Except if you choose varieties that are not adapted to canning or jamming... So maybe think of it now.
As for figs, we're speaking of a Zone5 location, so you need pots and/or greenhouses.
Some have made buried greenhouses. You should consider burying the winter-container. The dirt is the best heat-sink.
So you could either just bury the container and drag the trees inside - plan for a cart and a walkway to make the task easy- or build a semi-buried tunnel where the trees would stay the whole year long .
I would probably make both and see what works best for you ( your patience, your will to do this or rather that )
Good luck and keep us posted :) !