I am not too sure of what you are wanting to do but i have built a home docking cage for the empeg. I just use the normal home power supply and RCA cables and an ethernet cable into the back of the unit when the emeg is not in the hole the cables hang out when you want to plug it in i just connect the cables and slide it in.

I have used a stanndard empeg cage with the docking connector removed. The cables are slotted through the hole in the cage which line up perfectly ( even the home power supply good thinking empeg) the trick i has discovered to get the cables to slide through the hole easily is to behind the cage tape the three together and then the thicker cables RCA and Ethernet pull the power cable back and it slots in nicely.

You could power the empeg through the docking connector and take the RCAs out this way but the in car RCA are of a higher voltage i think. Also you have the problem of connecting in either your usb or ethernet cable which will need pluggin in anyway.

As to using a standard car radio mount i would be hesitant to do that as they won't be a good fit and the little dogs that pop out the top of the empeg will be held down which won't let the handle fold flush. As to damaging the box of the empeg i think that would take a good bit of force being 1mm stainless where as most stereos are 0.5mm tinplate. The front though might not take to kindly to pushing and shoving.

If you look at the links on the geek site you should find Brians site where he has made something similar or look back and you can find my post on the stand i have.