Interesting about the lack of internal back braces. In a Lott bass I have been studying here, the cross braces (apart from the centre brace) are only about 1cm tall and wide. The back's in reasonable condition. Perhaps cross bracing isn't as necessary as we think? Certainly won't keep a centre seam together if it wants to open up. When i think about it, the main reason i'm putting braces in my current build is to give the flat back a bit of convex "shape".
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