I think I know where he's going with this installer....
At least I'm hoping that you'r gonna have it pull the existing IOS' from the NAND, Backup the IOS' to SD, then Dip Patch/Replace IOS' from Desired Source. Knowing the way these guys have been coding lately, it's probably gonna have FS dumper built into it as an option. Might as well add channel manager to it as well to give it a Robust Manual mode.
EDIT: As a side note, I just browsed over to wehackwii.com to take a look at the news... and I noticed over on the right side of the page they have a little shoutbox, gadget and the talk on it is about CIOSCORP. hehehe