If you cross with the cochin- you will probably get feet that aren't completely feathered. I hatched a bunch of cochin x Jap chicks and they are all "booted"- more like a d'uccle than a cochin.
I'd think that the cuckoo x RIR would give you sex-links. But that might only be if their gender was flip-flopped.
I'd think that the cuckoo x RIR would give you sex-links. But that might only be if their gender was flip-flopped.