Not really a rack, but just a single level 5 sided melamine to put the tub into. I guess it works like a rack but just for single tub.
The reason I am planning on this is to keep the heat better inside the tub. Wood will cover 5 side and one opening. I am not pulling it side ways out, I will make it long way.

So my question is, has anyone used this method and has it increased the temperature little bit? Does it help at all? I am bringing in my baby ball this week and I want to be really safe before ball comes.