Nope he does use 2 x4s I have a 165 right now that is built the same way as this and it has no 2 x 4s they take up to much valuable space under there at first I was worried about the weight and then they all climbed up there and then pull me up too and nothing happened and that was 500 lbs of weight all together so I was completely confortable with the design a lot of people say u have to have the 2 x4s but u really don't he told me what the size is that he would suggest using steel but I can't remember right now. Any way if any one like this he can make u one too and talk to thinktank08 and he will give u his in put too.
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