That's what I'm doing,
I'm about to redo my carPC and make it more permanent and sort out a couple bugs that it has. What I'll be doing is scrapping the current system (as described a page or so back) and starting the comp with the unlocking of the doors from the standard remote, and then starting the car once my mobile is within bluetooth range. Also converting a spare alarm remote I have for my after market alarm so that the comp can operate it.
I'm also off to Ford on Monday and going to ask my mate about the steering lock. I'm hoping I can convert it to electrically operated and then smoothe over the key hole in the steering column. Also moving the start button so it's not so easy to press.
I'll post it all up when it's done.