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There are several variants of the rules out there. I favor this set of rules and notation for learning, as it provides details and a java script for checking rule validity. http://www.thedance.net/~roth/TECHBLOG/chess.html
Standard pieces have a 3.75” high King. Squares are 2.25” square. Note the comment about the overlaps. Some versions of the rules allow for six Attack Boards, and boards to invert – attach to the bottom as well as the top of the three main boards – so magnetic attachment would seem the way to go. The piece height is important because the attack board pedestals should be higher than that, and twice that spacing vertically between the mainboards.