Not a pic, but a concept I am working on to mount my 4D battery.
On my EB, there is a cross member just behind the axle. The Top Flange with the return would hook over that and then I would use an additional cross member to support the other flange that could be removed to drop the battery straight down. I am planning a 3D printed cover for the blades that screws into the top plate flange. The top plate will secure the battery with 4 3/8" bolts. the bottom of the box will have a cutout and padding to keep the battery from sliding around.
Design is still a tad rough. 1/8" formed Mild steel with welded on end caps. Ran it through a stress simulator and it's fine for that weight and more. Just my idea.