Inflatable Martian flyby spaceship

On Tue, 1 Dec 2009 16:20:20 +0100 (CET), Dave U. Random
wrote:

How about scrapping Orion / Ares I and using Falcon 9 / Dragon to get
astronauts in orbit and subsequently using Ares V to haul a large
inflatable spaceship based on Bigelow-like TransHab modules into orbit?

They could use Dragon or a private capsule to get to orbit, but would
it work as a reentry behicle for a planetary mission? If not, NASA
might as well build Orion anyway, at least.