Agree with others on most comments, lots of potential.
I would consider doing the following:
Start with fixing body problems, at least get an estimate before doing other mods, so you'll know if you want to continue other upgrades. That's going to cost some $$. If it costs too much, why continue modding?
Remove Tint on headlights.
Clear the headlight corners (remove amber lens).
Replace bumper marker lights with these:
http://www.ebay.com/itm/2000-02-LIN...:Lincoln|Model:LS&hash=item46017eba80&vxp=mtr
Remove lower grill mesh, paint black.
Paint upper mesh black.
Color match front grill chrome and rear license plate surround.
Remove added emblem below front fender molding.
Window tint.
Cut rear bumper/valence for exhaust tips/add exhaust tips:
http://www.lincolnvscadillac.com/showthread.php?t=44774
Get another shock tower strut cover:
http://www.lincolnvscadillac.com/showthread.php?t=82082
Clean engine bay/add intake manifold cover.
Get an intake heatshield from Hite337.
Get some more engine cowl/radiator cover plug holders to fill the holes.
Fill front license plate holes/paint (or attach license plate).
Paint passenger rear view mirror.
Re-route blue wire above subwoofer.
Black Caliper paint and black out chrome around windows.
Maybe tint the rear window brake light to match rear light tint (or tint entire rear window so it covers the window brake light).
Interior looks in good shape, like the wood etc (maybe replace floor mats with the fabric LS mats).
What are the round reflective things on all the front air vents on the dash?