Great work so far - what a Project!
This reminds me of one I saw for sale a few years back (Classified Ad. seems to have disappeared, however found a few old photos from when it was in use by Kent Police) - note the light bar!
https://www.google.com/search?q=mk1+skoda+octavia+police+car+gn53+loa&tbm=isch&ved=2ahUKEwi-lcbiirv8AhUvUaQEHTc-DwMQ2-cCegQIABAA&oq=mk1+skoda+octavia+police+car+gn53+loa&gs_lcp=CgNpbWcQAzoECCMQJ1C5BFjgKGCLK2gAcAB4AIABQogBqgSSAQIxMJgBAKABAaoBC2d3cy13aXotaW1nwAEB&sclient=img&ei=bVi8Y_6qMa-ikdUPt_y8GA&bih=937&biw=1920&rlz=1C1GCEA_enGB931GB931&safe=active&ssui=on#imgrc=IiB_f5SJABLIxM