If you were talking about any other animal, I would say sure, but rabbits are kinda funny critters. They are hindgut fermenter, so they will probably get alot more nutritional value than you think out of your hulls, but at the same time their kidneys are kind of funny, and some weird things can easily cause them problems (like lettuce, who would have guessed, we used to feed it all the time till they started peeing blood) Thats a interesting question and I will see if I can dig up more on rabbit nutrition from some of my text books....... (yay! study time!) My guess is going to be the cellulose present in the hulls is going to increase the fermentable sugars in your rabits colon, risking an overgroth of clostridium sp. and risk enterotoximea....
just an educated guess...