As retropin said, you are able to have a full scan done on a BG on a wide format scanner. I enquired about this and was told it would cost $100.00 per scan, however they could not take responsibility if the glass got broken. I decided to buy a desktop scanner at $100.00 and removed the top cover.
I invert the scanner on the front of the BG and scan all areas of the glass into a file on the computer ( x 6 scans), following this the 6 images can be lined up and overlaped inside the set dimensions of the BG. Then the hard tedious work starts redrawing the entire glass as shown in previous post. I plan on making a translight which as mentioned can be printed onto clear vinyl. The translucent areas/images on the translight could be backed with a white vinyl which allows light to pass through, everything else would be blocked. Following this the whole print could be laminated. I am currently experimenting with clear vinyls and white vinyls to repair small areas of a BG and looks quite promising. Pictured below is a white vinyl score reel window. This is mirror reversed and stuck to the rear of the BG and allows light to pass through. I works very well and believe will be long lasting as these vinyls come with a 5 or 7 year exterior use rating.

Greg