I need to build a freestanding 3'x4' platform about 4' off the ground as a base for a slide and steps. DIY guides I find online tend to use 3x4 or 4x4 posts for the vertical pieces and 2x6 for the deck framing. That's what I was planning to do but looking at instructions for the hardware kits you can buy they're using 2x4 for everything.
example here:
https://www.playstarinc.com/Content/...0PS%207720.pdf
Based on that I'm thinking of using 2x6 for the vertical supports and 2x4 for the deck framing due to the small size. Will that still be solid or should I stick to the original plan of using the same sized materials as a full size deck?