Updating FC5T3 DVD iso?

[Bruno Wolff III]

I tried installing from DVD last night and it failed. In graphical mode
it crashed and in text mode the screen was scrambled enough that it wasn't
safe for me to try the update since I wanted to be careful about which
partitions got formatted. (I filed bugs on these and a couple of things
dealing with the release notes.)

I see that anaconda has been updated since Monday. Can I copy the iso contents,
replace packages with updated ones (in particular anaconda), remake the iso
and expect it to work?