Another option you might want to consider is looking at 1x2x2 DUPLO pieces. They correspond to 4x2x4 lego pieces (slightly bigger than you are asking for, but not knowing the details of your build you might be able to incorporate these) and they interconnect (a 2x2 lego piece fits on a single DUPLO stud.) If you mount them sideways you get a 2x4 surface (but it would be 4 deep, not 2 deep as you requested). EDIT: This post shows how DUPLO and LEGO play together :)
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Added link to http://bricks.stackexchange.com/questions/38/are-duplo-blocks-compatible-with-lego-blocks-in-any-way
Phil B.
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Phil B.
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