As Steve says, the camera will likely clash with the legs. The Acratech GV2 “gimbal head” can have a similar issue even though it starts a few inches higher. If you have a centre column most need to raise it to gain clearance. This then affects rigidity. The other aspect to consider is that the weight is cantilevered off the centre of the tripod. Unless you want to risk it all toppling over, the tripod legs need to be positioned to ensure maximum stability. With this type of set up I’d limit weight to not more than a FF body and an 80-400mm.
Whilst I started down the Acratech gimbal path I gave since found that the ball head combined with something like a Wimberley sidekick or Induro GHBA to be far superior. Your camera is positioned closer to the tripod centre, you gain extra height and is relatively light and compact.
Tip: if you’re shooting overhead and find that the camera body I’d hitting the head (esp with gripped body) try tilting the sidekick back towards you slightly. It increase overhead tilt range significantly.
