anyone know of one?
Not got one, but I have a viper. I went down to my local store, with my viper, wanting a hardacse for it - was think SG case probably, it ended up fitting in the strat hard case, which happened to be dirt cheap as well... I suggest you do the same.
Your best bet would be to go to any local music store. The Viper is such a weird shape that either you need a huge case or one designed for it.