The central locking kits arent too expensive to purchase and a dead easyjob to fit so would probably be easier to buy new than to put on other car.
As for the ABS it would be possible, but wouldnt be an easy job, if on 13'' i would assume you would have to upgrade the wheels in order to get a brake disc system on the rear however dont qoute me on that. No doubt someone can comment if that is correct or not.
The ABS system has been said in the past that it has been a bit of a hinderence on the sei, especially on location of the bits when wanting to fit a strut brace however can be remedied.
I seem to remember some posts on here saying the abs wasnt particularly as impressive as hoped as well however i am only going from memory and may be wrong, but again someone will comment on that as well