MadPerry,
I don't think anyone can tell you if a fish is big enough to mount. I think it's up to you a 7lber is a nice walleye it's not a record and people have caught bigger ones but thats your choice. My first time fishing lake ontario back in the early 90's I went out with my high school science teacher, he told me your first time out you get the first fish. The first dipsy popped I was handed the rod and after a 20 min. fight a 29.6 lb king hit the deck! My first lake ontario fish. Charlie told me you gotta get that one mounted and then after looking at it, its tail was kinda chewed up and it had a few scars on it, he said ahhh you'll catch a bigger one, so I took it home and ate it. Anyway after 20 years of fishing lake ontario I haven't caught a bigger one. I kinda wish my first lake ontario kind was on the wall but the way I look at it I have a great picture and a great story.
Tom