I have taken 3/4 plywood and bolted it on top of a couple of mine. Makes the platform wider, only about 6 inches on each side, but makes a huge difference in comfort. Also makes a good place to attach some old carpet. Makes everything LOTS quieter.
However, I will say this. With some of the lesser expensive "plain" stands today, you can get something that is much more comfortable for little money and adding that comfort will make you a better hunter by keeping you from moving as much and getting you al ittle higher and out of sight.