Never say never. Everything can be fixed one way or another.
Options after you clean all that plastic off.
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1. get a bone yard transmission $$$$
2. drill and tap some holes in the case and bolt on a make shift bracket (no pun intended)
3. aluminum can be welded. Search for local machinists in your area and see if they would weld a solid piece back on that can be drilled out to match whatever it is you have there.
If it is a project car...you have one.
I bought one for a project and with the help of this site and actually experts I have it running and driving like new.
Don't give up but consider it a lesson learned.