I could show you pictures but you can't see anything because the wiring obscures everything, It really is a tight fit. To fit the fat daddy 510 you need to drill out the box 510 hole to 9mm. Then you need to thread the hole with a m10x1 tap. That means the fat daddy connector will screw into the box using it's own thread, as apposed to using the nut to fasten it.
I'm waiting on parts to build another one, should be here any day now. I'll make a little photo guide/walk through when it comes and post it here if you can wait a couple of days.
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Does anyone know if the varitube 510 is the same thread as the FDV?