The SidePower controller screws through the front. I'm not familiar with the controller in the pic.
I would think that there is a way to lift that helm. Just thinking logically...Mainship has made that space incredibly easy to access and work on for many, many years. I doubt that late in the game they threw that convention out the window. That helm has the pedigree of its predecessors. That area is a major confluence of DC power with a bunch of bus bars.
Look at how that wooden upper interfaces with the upholstered lower. Either the upper tilts up, or the entire thing tilts up.
For now, try removing the MFD and try reaching in from there.