Hi, I'm looking at building a very VERY low deck. No more than 5 or 6 inches off the ground total. This is necessary to incorporate a new back door opening on to the deck where currently there is a window. I wondering if it is possible to use 4x4 posts and lie them lengthwise on concrete footings instead of using 2x6 or 2x8 joists? The deck boards would then be attached directly to the 4x4's and 2x4's would be used for skirting and rim joists where necessary. Is this a plausible design? Thanks!