Thought I'd post a view of the centre console cavity of the Honda. Now I know the metal work may not look pretty but I'm limited to the tools I have - a drill, a bench vice and a few hammers, and the metal work has gone through a few alterations as I trialled the best way to get the tablet mounted.
As indicated in the text on the picture, all this installs and removes similar to the OEM Head unit and lower pocket. I have made this from aluminium - fairly thick for rigidity. The lower opening is filled with a large "C" section shaped aluminium frame, mounted on top is the 10 port USB HUB. Behind the "C" shaped enclosure/bracket are the SRS computer and various cables. The "C" section leaves over an inch space between it and the Vehicle cables and controllers behind it. There is plenty of room for other devices in this "C" shaped enclosure. When the SP2 Cradle mounting plate is installed it mounts across the top Bracket down to the top of this "C" enclosure and ties the two together to form a very rigid and strong unit.
Virtually the only connections into the Vehicle wiring is the Audio HVAC head unit Plug, I removed a socket from an old radio board so that I could just plug it in. There are only 4 cables coming from the trunk - 5volt USB power, Audio cable, USB to the rear HUB and the Control interface cable. The Control cable goes straight to the iDrive panel between the front seats.
The white USB drive plugged into the HUB is for Password security - It auto logs into the OS from a cold boot, later I'll incorporate a key fob transponder.
Half way down you can see the cut down Climate-Control / Audio head unit PCB (in the grey enclosure) None of this would have been possible without successfully cutting that in half.
Finally I'd like to repeat the fact that DAB and FM reception has improved out of sight with the Tablet install. Those of you who have looked at my old system will know that I built an RF shielded case for the M4 switch mode supply, and mounted the mini-ATX PC in the trunk with the PSU, and both inside another large aluminium case - I virtually eliminated interference from the PSU but could not get rid of all the noise from the MB and numerous cables.
I hadn't realised how insidious this noise was to DAB-FM and GPS as testing with the Tablet didn't seem to make that much difference - but it sure does when installed correctly.