I bough an XL last month and am now designing the fixed bed. So far, in every example I’ve seen or read, the wooden raised bed is quite high–12 to 24 inches.
Is there any reason not to use garden soil “in-place” and just build a low/shallow frame? For example, would a depth of 4" or 6" of frame around the garden plot be sufficient? The soil in our garden is already pretty good, and I see no reason to add a great deal of height to the frame unless I’m missing something.