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The turnbuckles are not for body adjustment. They are structural as the top connection to the cowl will exert a lot of force at the triple hinge as the body flexes.
The adjustments for the cowl doors to qtrs fit are done with cowl movement/ shims. The bottom fit has to do with how the bottom of the wood pillars are fit. The top fit wider or narrower is done by shimming the 2 braces that go from the upper panel seams to the wood sills.
The landaus work by having a bit of compression. This is done during top installation. If the center hinge point is loose then you will have problems making this happen properly.