Orange [I believe it is RED in my Rex world]
is A_B_C_ D_ ee
and REW is __ __ cc __ __
so unless your orange carries albino, in which case 1/2 of the kits will be REW,
then Id say most kits will be Chestnut [Castor in the Rex world]
And that is assuming that your REW doesn't carry non-extension,
if it does, then 1/2 the kits should be orange.
It would help to be more accurate in predicting if you know what is in the REW's background, besides REW.
Then we could know if there are likely recessives,
Same with the orange.
I like finding out what all my rabbits genotypes are. For me, having a lot of variety in the barn is FUN