no offense intended mate just my opinion, but you are making abit of a bodge up barry boys job of this. the wheels will just hit the filler arch and break it all off. and if they dont it will rust through within the next 2 weeks lol.
i would have bought some of those wide arches that you see on ebay and just cut all the rotten arch out and stuck the arch over the top. that way, it looks good, and wont catch.
u say your skint, but you have put a 900watt sub in the back of a car that yet... isnt road worthy. and remeber you have to run a sub in otherwise it will sound rubbish.

i have a 1.1 fiesta, and it will never sound like a TVR even with a straight pipe.
but im being a little harsh, its a good effort your making i guess, and anyone trying to keep an old fiesta on the road is doing a good deed in my eyes.

although i would get rid of the blue windscreen wipers and locks, they look very.... max power