No, there is no formal internship. However, contact the pro-haunts around you. Tell them you're a theatre major, and ask if they sould need any help (make sure they don't throw you into an actor position, as that does nothing for scene design) I'm sure they would greatly appreciate any help with making scenes you can give them. And yes, they will show you pointers along the way.
*PM me if you have any questions*
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