Yeah, if you have never done it before, its likely gonna take you at least two weeks, and thats assuming you can look at all the resources in the extras file and know what they are and where to look for them when you test it. But thats not very likely. I went on the fastest theme rampage of my life a week ago when I lost all of my NeXT progress and redid the Extras.rsrc file from scratch, top to bottom it took 15 hours straight. And I would consider myself VERY fast at the process. I did ChosenOS in three days this week.

I think as a first timer you will get confused with the carbon push and popup buttons, the tabs may be a trouble area, progress bars could be depending on how simple or complex you want them to look and if you have any elements that dont have perfect square edges you may run into alpha masking problems or premultiplication problems. Check this thread regarding that:

http://forums.macnn.com/showthread....threadid=138168