I started out by dovetailing the planes. I have since changed to rivets or screws. For riveting I milled a row of tenons into the base and then peined them over the sides. For the screws; tap the base put a small countersink on the sides, locktite the screws and mill the heads of the screws off. Look at Karl Holtey's plane web page and blogs. The dovetails create a lot of stress and are hard to keep square and alignment.
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