first off if you have no access to the trunk from inside the car through the back seat, give yourself another method of opening the trunk, if the solenoid fails you'll have to cut it open. with my trunk fully installed i can't get in there from indise the car so i added the other solenoid.
to remove the key hole, weld in a small circle panel, then use bondo to smooth it out. Technically, i use Kitty hair (fiberglass reinforced filler) to do 90% of the smoothing. I just think its cheap insurance againist cracking, then bondo, primer then glazing putty. Get a good catalized primer, they will fill 60 git scratches. No rattle cans! if you use the correct materals it actually easier, not cheaper, but you get what you pay for.
for the bumper skins i used "flexable bumper repair" from perma-tex it is a 2 part epoxy type thing. I actually glued a crack in the skin with it. seems to work really good. SEM also makes some stuff but it about 4 times the price. the perma-text was at pep boys for $4.
i filled the lights in front with a fiberglass panel glassed on then smoothed, kitty hair, and so on like the key hole.
the tailights were a CHORE!!!! if you do it right you want to match the conour of the trunk, there is vertical and horizontal curves (compound curves) took 16 hrs to just get it all welded up, ready for body work. i will have some pics of it just metal soon.