I've built my first ipk, actually 2. less and tcsh and they both seem to work on RC5.
Ok, it's not much, but it's a start and I would like to contribute the ipks, assuming they're useful... but I've no idea how to do this.
GREAT job on the OS by the way, and also the tutorials on how to build using the SDK.
Didn't have any problems at all building on Mandrake 10.