I just add a small not ork part to those who I always take with cybork (like my nob squad) and for units that sometimes get it like my ard boys, I just explain to my opponent that today that squad has bionic toes that you can't see as they are wearing boots (or something equally silly) and then show them the list so that they can see I paid the points for them.
For the nobs just glue on a know-what, a miscellaneous piece of metal, armor, weapon, etc. from the bits box, making sure to put it somewhere that it is not normally used. For example if I use a piece of armor I would glue it on the bum, or on a foot as opposed to the shoulder/chest area that armor usually goes on.
Something that is cool that I did a while back (sorry no pictures) is use leftover space marine parts. You know all those little seals, scopes, auspix, and spare arm bits that come with the sprue's. Give an ork a purity seal on its elbow and presto; counts as cybork. Scope on the forearm, chop up a spare arm and extend the forearm of an ork with it, presto; cybork. The possibilities are endless.
You really can't do it wrong, as they are orks. So a bit here or a piece there and you have cybork.