Yes, I will work on Cacko ROM for C3000 as soon as I get one device for me. I might be traveling to the US in the next couple of months, so that should help me get one without an overhead of importing to Russia.
As for the kernel patches - some of them will apply cleanly to C3000 kernel source, most will not. Some of the the patches have corresponding C3000 ones from piro, some will have to be rewritten (such as battery patch)
Finaly, I have no idea what Sharp ROM version was used for C-series Cacko ROMs - they were started by sash ages ago. Very likely some of the early releases. In any case making a diff won't be easy, there are way to many changes... I can easily bet that half of the binaries have been replaced.