Forget the immobiliser, who is going to nick it? Take the steering wheel off thats as good as anything.
I have the intercom, a waste if money, never used it.
I used one of the wife's black leather clutch bags for a storage pocket it just happens to be a Mulbery and looks the part, brass plate and turn buckle with a flap to keep the rain out.
If you are going to do some traveling consider a luggage rack, that will be my next add on I think.
Best of luck with your decisions.
