That Fiesta didn't end up too well on its roof!
Stereo looks nice, and is the CD changer working?
In regards to the 5 stud conversion, you'd need to convert the rear drum brakes to discs first and then use the hubs from the SP20. Front hubs just swap over (
Read this for more info). Alternatively you can use the US model GF 626 rear drum brakes as they are 5 stud. Aussie models had rear discs instead.