I put the cat enclosure together myself and had no issues except the pre-drilled holes were missing for the little cat door hook and eyes on the upper section.  I just measured it out, marked it and screwed them in.  It went together beautifully and was just what I needed.  I am using it indoors.  The wood is soft and not treated as far as I can tell, so I don't think it would stand up to the elements outside for very long.  But that isn't an issue for me.  Now if I can just get the cats to go in it, I'll be very happy!