Technic beam centering for beam with even length I design stereo camera housing for robotics (3d printing). I want the housing to be able to connect to both LEGO Classic and LEGO Technic blocks. I designed 2 groups of 4x4 holes/pins on the bottom/top of the case for LEGO Classic. This works fine using the camera as "intermediary" piece (connecting bricks both from bottom and top and incorporating the camera into a LEGO robot).

However I also want Technic to mate the camera. I came up with holes for Technic pins which make some of the "Classic" holes deeper. The problem is Technic uses odd number for beams so they can center with one hole. Is there a part (maybe 2-sided double-beam) that would connect even to odd and allowed me to center the camera on LEGO Technic properly?

Sure I could move the holes one step to sides (make beam 5 fit) but that would produce the same problem on the Classic side (centering, using 7x2 or 8x2 instead of 6x2).

Camera bottom side (hole in the center is for tripod screw):



Camera top side:
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.