As for power steering - some later production (but still "B" generation) Corsas had full electric power assisted steering column instead of hydraulic rack. It's easy to find complete kit in UK because it's often used to retro-fit PS into oldtimers or kitcars; here's first
search result at eBay. In Poland it would cost ~100€ because we've imported a lot of UK cars and RHD stuff is useless...
You'd still have to check if there were some changes in body bracket for steering column between hydraulic and EPS cars; even with some mods needed I think it's still worth it!