looks like you are trying to run it as an update.zip, it's not signed by moto so you won't be able to load it like that. Just run it like a ROM, install zip from sdcard>choose zip>maderstcok
That was what I was doing. I PM'd maderschramm and he suggested moving it to the main root of my sdcard, so I'm going to give that a try right now.
Gingerbread (.605 rooted) | Apex 2.0 RC4 ROM | Stock theme | OC'd @ 1.30GHz, ULV with Droid X Overclock