Build timber frame to block under bed

I need someone to come over and build me an L shape frame 300mm high, 2075mm long by 1585mm wide to block the underside of the bed. Cats keep going underneath and destroy my linen and hide for days. I want it to sit flush with the existing bed frame I have two pieces of chipboard that should be enough to form the shape, just need to cut their width to 300 from 500 and then clue them together