There is nothing wrong with this but the original makers are normally available and IMO better. If you want to make a rom instead of jumping on someone's work why not make your own from scratch?
I my self take roms and add to them, cherry picking the best things of others for my own use but I'd never put them up as my own work.
There are even unofficial nightlys for goodness sake!
Am I the only one who thinks this? Id love to know...... :P
Sent using reversed alien technology...