The OP is building his layout in a bedroom so I think he has several options to choose from. Here is what I did for my basement layout.
I had an inexpensive carpet in the basement when Hurricane Irene hit us back in 2011. I was in California so I couldn't help my wife try to keep the place intact. It rained for 24 hours and for 14 hours of that we had no power, so we wound up with about 2 inches of water in the basement. All our electrical power lines are underground so it could have been a lot worse. I decided no more carpet and am using the rubber mats where I walk. These are great.
When I need to get on the concrete under the table I use a foam camping sleeping pad that works very well, a lot more cushion than carpet. If you are going to go without carpet, these pads come in different thicknesses and are great to kneel and sit on. (Note: my layout table is 48" high.)
