use this tool to edit the rom before flashing it.
WP7 Rom Tools by AnDim - xda-developers
Delete out the marketplace, MP3 Trimmer, Voice mail related files......
Then you can flash the rom.
This will save space as well.
Been doing this for a while. I normally rip out Palringo and replace a few files. Been adding in FieldTest.exe into the ROM as well.