Originally Posted by derby2*
Do I clap 2x6's around a 4x4 and simply cut out a rectangle in the interior of two 2x6's and then finish the recess with molding?
should I use treated southern pine or can I use untreated fir or pine?
Just face your 4x4 with pine lumber. (you can't use fir - it'll melt in a year). You can either do it as you describe (cut out a rectangle and finish with moulding) or you can use two long strips for the sides, and two short strips for the middle, top and bottom (rather than trying to cut out a rectangle from the middle). It'll probably be quicker, cleaner, and produce less waste to do it with 4 pieces rather than one.