I love this birdhouse!  It seems 2b of good quality, but time will tell. It was very easy 2 put separately bought 4x4 and a PVC sleeve for it.  

I put 2 exterior screws, 1 on opposite sides, through the cap at bottom that went over 4x4 2 make it sturdier.  I put post about 1 1/2 ft in ground.