Yooper - believe me, from a expertise standpoint, I'm in NO position to critique your grapple. You said you appreciate other viewpoints, so bear with me.... 
I saw your pictures at work lunchtime today, and honestly thought it stuck out there a ways.  Then later Wolfman said the same thing.  
 
Tonight I tried to explain to a member on the forum BX series loader capacities at pins, 500mm forward, etc. , and the physics involved.  Got me thinking of your pictures.
Handling logs, wood, etc. is something I do know a little about.     
What are you trying to handle with it?
I do not know the capabilities of your L series - but, honestly, my only thought was how that arrangement will limit the size of log you're looking to handle.  With that said - there are some advantages to keeping that out there with the rotator.....
But in your application, I don't care for the horizontal arrangement/perpendicular to the plate, and using the tilt of the loader, either....
I wouldn't want to tackle a 16'x24" hickory with it, but I bet your setup would handle some decent softwood, and smaller hardwood stuff as is.  
Otherwise - as I've said again and again - really enjoy your builds and ingenuity. Thanks so much!