Welcom to the club!!
Central locking can be done the universal route if your handy with a drill & screw driver, or you can go to the ripoff merchants them selfs and get the original Fiat parts.
As for electric windows i have found the universal route total shait! Try and find a smashed mk2 in your local scrappy and take all the bits that you need, they fit and they do the job they were made for.
But again Welcome