Dan:
You said: "My only concern with conventionally built floor would be the point loads on the internal posts."
I would assume you meant "point load of the internal posts" on the first floor deck from the second floor or roof system above.
Which is true and you should be concerned. If you do have internal posts they need to be properly supported all the way to the foundation or cellar footings. As with the wall posts the decking can be cut and the posts bottom would be trimmed to fit around any rim joist so that posts will fit properly and be supported properly.
To do any internal post you can either cut the decking and extend the post threw the decking to some proper supporting substructure, or block up the decking from underneath and support this blocking properly so that the post point load is transfered again to the foundation or cellar pillar footings.
Proper planning will prevent poor performance.
Good luck with your project.
Jim Rogers
