Help Making 17" Wood Frame For Fan Mount

I need a simple square wood frame with 14" inner dimension to provide backing for a rooftop fan on my van (see pics). I found some 2x2 pieces on the FREE shelf that will work. A couple quick cuts with chop saw, rip 2x4 down middle. Then a way to glue the ends together (I’m thinking lap joint). I’m here now and will be until 5:00 or 6:00pm.
Thanks, Dave P. Tel: 206-422-4428

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