Body panel replacement tips/advice needed

the flange in the trunk is now a big deal at all. i just grind that small area and put one nice coat of filler over that area, and it all blends in. 1/2 hr fix. like flyr said...by the time you get a coat of epoxy and your undercoat down. you ll never know it s there. did this on my 71. totally invisible. i just think you re gonna get more warpage than you want by butt- welding, but if thats what you wanna do...do it. i ve been trying to post some pics of how i butt welded my inner fenders but it wouldn t let me do it. let me try again.