Alex,
Thanks for posting these.
I can copy the idea and make my own bracket. Your use of single flash with stofen is good, as can't afford the twin head set up after my lastest purchase.
When made my problem will be finding a bug that has not gone into hibernation.
I have the 50mm f1.4 and think I need to shade the rear element a bit. Do you suffer from flare with yours ? Your pic 3 looks good as the flash mount screwing into the lens acts as a hood.
Now off to the workshop.
Don