Power2go:
Yes that was the idea when i was compiling it. Also includes some new combinations between the prada and cookie aswell as new stuff like the browser.
Following what torquin said, the CUST is basically a large folder that the phone references from. First extract your CUST from your phone using kp500-utils. Then open it with winimage.
Also open the CUST I posted with winimage, and then copy the .dmf folder into your own CUST (from your mobile) overwriting what is currently there.
Also if you want the browser, open up the CUST i posted and extract the 'Ref' folder which can be found under the 'obigo' folder. Copy this into your CUST replacing the files and you'll have the new browser

It's not that hard to do.