Technic beam centering for beam with even length
Hmm...  I don't know...  I personally, wouldn't try to reinvent pin placement of Technic holes and Studs. I'm not saying being creative that way is too challenging. What I am saying is that, we should work with examples, or in this case parts that already bridge Classic stud width with Technic holes. 

Placing pins where the studs belong seems akin to reinventing the wheel, when we could be building off the long work history already put into the wheel's design, and spring board off that instead.  

With that said, I'd point you to a Technic 2 x 4 plate with three holes.  



Replicate it, split it in half (lengthwise), and embed the top on to the top of the camera housing.  Take the split bottom half and embed that into the bottom of the camera housing. 

Visually, to me, the stud width of your design looks like a Technic 2x6, but there seems to be enough room to jam a Technic 2x8 in there.





For my brain to work, I like pictures.  So, for piece inspiration, I'd go to Bricklink's database and just type "pin", "pins" or "holes" and look at the pictures of parts that have a key word in them.  Doing this expands the possibilities of what could be done to make your design solid.



               





Also for me, it's easier to reverse engineer things I see.  So, for ideas I would BL search these parts, look up the sets that they were in, and watch a Youtube * speed build of one of these Technic sets to see how the part was used, and maybe come across an ingenious way someone mated Classic studs with Technic pinage.

(* When dealing with Youtube. Time is precious and limited, so remember we can reclaim some time by speeding up YT playback with the settings "gear".)   

EDIT

Another design compatibility suggestion:

There are no pictures showing the total height of your camera rig.  I'm just imagining it inside a robot, or something, and the height of it doesn't conform to the standard bricks built around it. 

Try to standardize your work, by making  sure the total height is equal to a pillar of bricks, and round the entire height to the nearest brick.