Fotodiox beat Really Right Stuff to designing the first truly useable Arca Swiss L-bracket for the Fujifilm GFX 50S. It allows Full access to the battery compartment without having to remove the bracket and uses thumbscrews so no tools are required. You can get the Fotodiox Exxy L-Bracket for Fujifilm GFX 50S from Amazon / B&H Photo / Adorama.