Here you go.
The back artwork fits pretty well, but there's this little awkward bit at the bottom. No prob, we can fix that in about 5 minutes, tops.

Select > Copy > Paste this chunk of the cover.

At the top menu:
Edit > Free Transform or Rotate. Then just move it into position. For the other corner, just hit "paste" again, then go to Edit > Transform > Flip Horizontal. Now just move it to the other corner as in the pic.

Now we need a bar across the bottom to finish the border. Same as before. Select the chunk that you want, blah blah blah.

Bam! They're all in place. Now just carefully erase the extra bits that are covering up the type and whatnot and you're good to go!

GameShark Double UGCThe controller pack takes a bit more work, but is still WAY doable with the right tools.
Paste the back cover into the file and (gasp!) upscale it so that it fits like so.


Normally I don't recommend scaling anything up, but it gets the job done in this instance, plus that scan isn't all that great in the 1st place, so whatever.
Select > Copy > Paste the N64 logo at the top and scoot it over.

Ever use the Stamp/Clone tool? It's about the greatest thing EVAR! Hold down Alt, left click and area, then let go of alt and press and hold left click to paint a clone of the area that you just clicked before. Play with it for a bit, it's really, REALLY useful.
This is how we'll clean up the crap in the corner that got cut off by our scaling. Losing it is actually good, since it's redundant. My template already contains the legal jargon and whatnot.

Select > Copy > Paste this little icon from the upper right.

Gonna need to move that warning box to make room. Select/Copy/Paste or the Stamp tool can get the job done.

Then push the icon bar over and Edit > Transform > Scale. Drag it to a size that works and nudge into its new home.

Use the Lasso tool (looks like a little lasso. Right click to select the Polygonal Lasso which looks like a pointy lasso). Select the area(s) that you need to use the stamp tool in order to remove the image of the Controller Pack in the background.

Go back and use the Stamp again to remove the icon from its original location and you're pretty much done!
Controller PackI didn't cover the spine type because I'm fairly certain that you can sort that one out. Just make the type bigger LOL!
Hope this helps.