The overall dimensions are 10" x 8", which which is approximately the same as the aluminum bases. However, I did not angle the feet as on the aluminum base. The feet are countersunk and drilled to accept a 1/4" carriage bolt. I certainly recommend bolting the base down before attempting to mount a SPT.
As I built them I made some changes. I will now have to go back to my drawing and modify it. If you are going to mount a jointer with the dust port attached, you will have to cut a relief angle on the side of the cross piece in order to obtain clearance.
Mounting bases
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