if your handy with wood, heres what you might try..
if you can take the canopy off , cut the 3 pieces for the sides, and what ever you wan to do with the back, mine is open for ventalation, for the glue you'll want to save the sawdust from the wood you cut, mix it with wood glue, it will make like a paste, then glue your wood together, when the wood drys sand the area, you won't even see the area you glued because the glue you used is made from the sawdust.
i've done this many times.
good luck, let me know if you need any help..