this would be aswell being a uksc club car its been round a few members now glad your getting cracked on with it, a rusty sill is easy to repair, i did 1 on my glanza, although i couldnt buy a starlet sill in 1 piece from toyota they sell it in 3 different parts, 1 of them being a rear 1/4 panel! i ended up having to use 1 off a fiesta. mines was a lot worse than that aswell and fixed never had a problem with it again! keep at it buddy dont let it put you off like the others where