Ref: the immobiliser, why not just fit a secret switch wired into either the fuel pump or the low tension circuit, much cheaper and probably just as good.
The storage pocket whilst undoubtedly useful is awfully expensive, there are other storage options which are much cheaper. ie. nets, parcel shelf, pockets, etc.
Almost anything is cheaper to have fitted later if you really want it, but it depends on what your value for money index is like.
