Thanks Spaghetti. (And apologies for your impending phone bill in advance).
The Carnetix has performed faultlessly so far. Since I wrote the log I have had about two weeks of testing and have no problems to report.
I can't comment on the ability of the Carnetix to survive cranking as the FTO cuts power to the radio while cranking so I would need to go the tank circuit route to solve that one. Since I don't do much start-stop driving I don't consider this a problem though.
To get an idea of the load, I am still running the system specified in my project log plus the LinITX Touchscreen from the P1260. Since then I have also installed a USB GPS module which draws 90-110mA, and a Orinoco USB client with external 7dB omni directional antenna which has been known to draw anything between 420 and 540mA, plus a second mouse from the PS2 mouse port which is wired as a centre console jog wheel for controlling the most common functions.
The only
Incident I have had with the setup so far was when I inadvertently
did crank the engine while the kit was running which must have confused the Epia somewhat as the VGA shut down for about 10 seconds. Although I
NOW know that this was the reason, I didn't at the time and was somewhat freaked out to put it mildly by a white fading
"you've fried your TFT" type pattern with a saturated bloody Jurassic Park Logo in the background!!!!!!
It was only when I got back home and searched the forums that I learned this is a common occurrence on Lilliputs (So now we all know that LinITX monitors do it too).