In a huge quandry. Have to ship 4 pieces to a gallery in Hawaii.. The piecesare delicate as in this one http://www.muniart.org/2669/index.htm and the size is tight for priority usps which is by far the cheapest way to go. Around $100 as apposed to $200 by ups and fedex. The problem is I have to keep my dimensions for the girth plus lenght under 108". The pieces are 24' in diam. and 6" high so the box can only be around 28 square and 10' high and I would like to ship them safely.Should I build a 1/4 plywood box with some foamboard on the inside or outside clad it with cardboard, screw the piece to the backside and fill with peanuts. Any suggestions?