I would say to start with a black tail red bird(maybe buff bird but they have too many genes hidden) one that is wheaten(eWh/eWh) Db/Db(or Co/Co Citron Columbian could look awesome) and add the pheomelanin Diluter ig cream(which is recessive, found on cream dutch, cream legbars, light cream leghorns, and citron spangled hamburgs) and that´s about it...