First, understand that virtually no 2 gibson guitars are ever the same, and frequently the published specs were not accurate.
The plans were taken from several sources including 3 original tracings from vintage instruments and the book Fabulous flat-tops written (in part) by Dan Erlewine. It has detailed info about bracing etc.
The AJ plans we sell are not 100% historically accurate. We had a lot of info to go on, but we had to fill in the holes in a few places. These are about as good of a guess as to what these guitars were as we were able to come up with.
With that said the AJ claims to have a slightly longer body than the j45 - 21" vs. 20" (but our tracings were short of the posted stats), and it has a 25.5" scale length vs. 24.75". These are the biggest differences structurally.
_________________ Brock PolingColumbus, Ohio http://www.polingguitars.com
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