That's awesome JonD. Did you shorten it at all?
I'm about to go down this path as well; Waiting on my brother to ship out the GBB that's already at his house. I'm thinking of cutting off 1.5" to get it to 44", adding lead tape and setting it up to fade. I'll then probably move the weight on the F7 to the heel side. Use the GBB on tight holes or ones that require a fade, and if it's wide open or need a draw use the F7. Sounds great in theory.
Not yet as I just got it but I'll probably end up trimming it a little. Need to get some range time with it to figure out how much though.