Husband did our deck three years ago, even placed a three quather of a circle on one corner of the edge of main deck. Few blue solar deck lights and its deadly.
Just put up a raised playhouse for the kids and did a deck and platform and steps around the house. On very sloping ground, as someone said getting the levels for the posts in the ground is the hardest and most time consuming. B&Q deck boards in athlone special at moment €3. We made the handrail of out 2 by 2 so whole thing extremely cheap.