I am only new to this myself, but if it helps, the 2 player CP on my bartop now just 'slots' straight in and out of the cabinet, held in place only by some wood battens forming a groove into which the CP can slot. The i-pac is attached to the Control panel, so all I have is a USB cable from the i-pac that unplugs from a socket in the cab directly underneath the CP. I haven't had any problems with it being pulled out as yet, and although I am not using it for fighting games, my two kids can get pretty aggressive just playing 1943 !
In the future, (maybe for my 2nd build) I am planning on using my current CP design plus building a 1 player CP with a trackball, that I can just interchange the two.
JohnSt Clair's 'Build your own arcade' book was my starting point too. I am only building a simple bartop at the moment, but I found the book a very "accessible entry point" into this hobby, and I still enjoy re-reading it now, much to the utter bewilderment of my wife.