DIY Desk / DJ Stand from Acrylic
I'd like some more project details, but 10kg isn't really that much of a load, but it all depends on how everything is supported. If the load is cantilevered out 1m from the anchors, then you're going to need much thicker platforms than if you have doubly-supported structures.

If you're into laser cutting things, acrylic is laser cuttable, which makes it easier to work with. Unfortunately, it has a tendency to shatter when it breaks. In this case, you'll want a thick enough piece to keep the material stress below failure. Without knowing how it's supported, it's impossible to say how thick to make this, but I doubt you could go wrong with anything greater than 1/2" or 12mm.

If you plan to cut the panels with a saw, then polycarbonate is probably the best option. Impact/shatter-resistant, it's unlikely to break at all. For this material, you'll want it to be thicker to prevent it from deflecting. It's not about strength, but stiffness. 1/4" or 6mm could be enough, but, again, it depends so much on geometry.