Lowering - check Ebay for springs! New from Autobarn/equivalent places should set you back around $300+, but on Ebay you can get them for as little as $100. Make sure you get some (new) shocks that match your new springs.
17" BA XR copies - where are you based? I've heard that The Tyre Factory in Dandenong (if you're Melbourne based) sells a lot of types of copies, so you might get lucky there. Price? I dunno, but getting the rims shod in rubber is pretty cheap these days.
Full bare metal respray - $$$ = at least four figures.
Full leather trim - reupholstering would set you back a couple of thousand. Full leather seats (front & back, to suit EA-ED Fords) could be sourced from Ebay for several hundred dollars. Most likely from an LTD or Ghia.
Yep, cars aren't cheap! Let us know what you end up doing mate
I'm going to get mine resprayed sometime, as the roof & bonnet are crap, but I'm sticking with black so it'll be a "doors closed" respray. This will probably set me back $500-$800 depending on where I go. Something I gotta look into.
My springs (superlows) cost me $150, I bought them off a fellow forum (.au) member & fitted them with a mate. I used my standard shocks & they're stuffed now lol