What is the best way, or does anyone have a DIY to mount an LCD in the upper pocket of non-nav cars?

Did a quick search and came up empty.

I found this:
http://www.digitalwheelz.com/G35Scre...ng_Models.html

But $700 is a bit much. I already have a 7 inch LCD from a previous car. If I don't hear back I guess I will have to fab my own mount. I also plan on mounting a DVD player/receiver in the upper glovebox. I have some leftover ABS sheet to fabricate from.

Also anyone know where I can get a 4-channel input to the factory system? IIRC the PAC-NIS2 is only 2 channel for 2 devices. Only option I can think of now is to use Y cables to the amp and run a second set of RCA's back to my AMP. That would mean turn off the factory unit when the DVD unit is in use and use the volume control on that unit.

Thanks,
Pete