39 s bed with three quarter inch plywood being employed for the larger beds it should be understood that the above described mattress frame 12 and planar platform 14 constitute a complete bed frame of themselves and can be supported on a floor without benefit of the pedestal frame 16 and cross shaped support 18 however for appearance and convenience purposes it is preferred and is customary that the mattress frame 12 and planar platform 14 be supported on the pedestal frame 16 and the cross shaped support 18 the pedestal frame 16 is seen to be an open generally rectangular structure similar to the above described mattress support frame 12 but preferably is smaller with regard to its length and width dimensions the pedestal frame 16 includes a spaced apart parallel pair of side wall members or planks 30 and 32 which are interconnected on their aligned opposite ends by a pair of end wall members or planks 34 and 36 it is preferred that the side and end wall members 30 32 34 and 36 be fabricated of wooden planks having suitable length dimensions and having cross sectional dimensions which measure 2 u00d7 6 inches 2 u00d7 8 inches or 2 u00d7 10 inches as determined by the desired height of the waterbed frame structure 10 the side and end wall members are preferrably interconnected by the same special interlocking corner joints 28 which are used in the mattress frame 12 and as will hereinafter be described in detail as is customary in waterbed frames the free standing cross shaped support 18 is placed within the pedestal frame 16 to help support the load.