I know I'm a bit late, but as I started this thread over 10 years ago I feel that I am allowed to comment.......
..... The whole project has developed over the years to the stage where I now have the boot release operated from the key fob, the switch inside which used to be for the boot release now works the hood cover release ( solenoid operating a cable, operating the catches), and the petrol flap system has been very simplified with a single solenoid pulling a cable from near the battery.
As far as cable clamps go, I found that as there is only a small force going through the system, there was very little chance of the cables pulling themselves open (once it was all adjusted correctly) and I simply used normal wire crimp connectors of whatever size was appropriate (either blue or yellow). I found that i had to run a drill bit through the 'straight through' connectors to remove the internal stop burr, then the bike cables will just slide through, loop over the catch, pass back through the crimp and then crush them in the usual way. Not had one fail yet - but not going to be as strong as Robs suggestion above (which is what I was intending to use until I decided that my 'temporary' system fitted for setting it all up seemed strong enough to remain in place.
