You should make a Soviet era re-entry vehicle for him...or some sort of Russian era capsule.
Ohh....and Laika! Too bad there aren't any realistic dog skeletons out there. There's the Rement skeleton dog, but I don't know about that.
Question, how did you do the CCCP on the helmet?
As an owner of a ReMent skele-dog I can say, with sufficient authority, that it's realistic enough for the proposed custom.