I would like to build a composite deck where I have a patio now. The problem would be the window and the air intake and dryer outtake. How would I have this built with access to these things? I was thinking of going up to the water spigot with the deck so as not to have to address this problem. This would make it 14'6" by 14" deck. Also because of the window and vents a full ledger board would be a problem? Would a free standing deck be possible by not having a ledger board and not disturbing the siding? Also the slope would have to be addressed as the picture (picture not posted) suggests, I was thinking just filling it in and slopping it to the yard with plastic on top. Could this be done without railings with a step down on the outside?