Thank you. The 1-3/8"center distance between the first row of screw holes seems to be close to the Bigsby hole pattern except for the lower screw. On Stewart-MacDonald's website it shows a B6 and specifies 1-5/16" between the upper screws and 1-3/16" to the lower mounting screw. To verify, I would need to buy a B6 for about $150 and measure it. In any case, it seems that there are too many variables (i.e. string pitch, nut, bridge etc...) that pose a risk. Therefore, shelving this project for now is the best advice.
As to the piece on e-bay, besides being way out of my budget, I noticed that it did not have a picture of the guitar bottom showing the Bigsby hinge and strap button. On the reissue model, is the Bigsby factory installed?
For now, the lower end Gretsch (5122 model) which comes with the Bigsby already installed is about $650. This may be my best work horse alternative.
Thank you again for all your help. If you have a chance, please post a picture of your 2006 jazz box showing the Bigsby hinge.