Upload & Sell: Off
This is Matt. I designed the B5D3-L and conventional plate. We are having our local contact bring us his production 5D Mark III, which we will check against our conventional and L-plates in stock. Stay tuned. Some of the pics on this topic here have me concerned, so we have to make sure that our plates are fitting correctly.
A word on the rear lip of the plate. You cannot easily see it, but the contours of the body's bottom rear are spline shaped, unlike nearly every other prosumer body which have a flat bottom and simple radiused back corner. Placing an emphasis of "level and not twisting" over "aesthetics" is what drove our approach.
Honestly, I am more concerned that the plates may be putting the camera body out of level, than the aesthetic of the plate fit itself.
Regarding the pics with the quick level in the shot: do not trust them. To properly measure whether an installed plate is squared up, you need a granite surface plate, 123 blocks, and a height gauge with dial indicator at the very least. It should be measured against something more precise than the gasket, like say, the lens mount. In fact, the surprisingly spongy and poorly installed gasket on the Mark III body we measured was not square with the lens mount at all. The gasket also contributed to the rather "hard fit" design of this particular plate.
Again, stay tuned. We will update this forum with our findings. In the meantime, you are more than welcome to take advantage of our return policy if the fit just doesn't sit well with you. Thanks