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It's called a flex rocker because the rocker is made deliberately flimsy so that the weight of the scope pushes the bearings into contact with the groundboard. The azimuth bearings are located directly under the altitude bearings. Because of this thin ply or aluminium is all that is needed to connect the three or fours altitude support points. I have made two of these for my 12 inch dob. It is surprising how light this style of mount can be. It is also very stable. If you make a flex rocker, do not make it stiff with double thickness ply, there is simply no need to and your base may well be uneven if it is overbuilt.
The mount in the links you gave is not a flex rocker and would not be as stable as one. I agree with everything Tim said and yes look at Mel's tri-dob and Dan Gray's designs. They are really well thought out. I wound up retrofitting a pivot on mine too for simplicity so it looks like a very simple version of Dan's.
Rod.
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