When it came to fitting ethernet and DC plugs in the sled, I decided to follow the Way of The Lord -- a piece of 1/2" plywood secured with sheet metal screws and tapped to accept ethernet and power. My big dilemma? What to secure these with -- I wanted something that would flex just a bit on the RJ45. Answer? Some ancient Shoe Goo from my closet. Some polyurethane caulk would have worked, too.

On the RJ-45 I trimmed away the retaining clip and the anti-snag hood. Important to use one with a nice strain-relief boot, though, for proper Shoe Goo grip.