"Will McLean" wrote in
ups.com:

The CEV/CLV *could* do assembly, delivering modules instead of the
unpressurized cargo module. They've chosen not to do that, choosing
not to modify modules designed to launch on the shuttle. But there's
nothing impossible about it.

They'd have to modify the CLV as well; some of the modules will be beyond
its lift capacity once the propulsion, guidance, and ISS docking/berthing
systems are added in.

Like you said, not fundamentally impossible, but costly in terms of both
money and time.


--
JRF

Reply-to address spam-proofed - to reply by E-mail,
check "Organization" (I am not assimilated) and
think one step ahead of IBM.