If you consider yourself an anti-speciesist:
Using dead nonhuman animal bodies in art and for design, displays, etc. can never be consensual, because you don’t understand enough what a nonhuman individual might want or not want, to be able to definitely claim that he/she was okay with you using his/her body.
Don’t use nonhumans bodies in arts.
Why can’t you make vegan arts if you call yourself a vegan? Where should veganism unnecessarily end?
Check out alternatives, like the technique of artists like Keng Lye, for example, who creates realisitc 3-D arts.