Here's a couple pics that may save you a few minutes. I picked up a variety kit of these rubber emissions plugs/caps at the local auto parts store. Pick one that fits snugly, and reach in there with some needle nose pliers (use a little spit) and it'll slide right on. I did this because I don't care for any extra hoses, etc. cluttering up the look.
The third pic is the tank vent line that runs to the canister....do NOT plug this. Either leave it alone, or you can cut it short like I did (one less hose.) BTW, I packed the end of it with a gun bore cleaning patch with a little motor oil on it (so it can't pull debris into the tank)....just make sure you can get air through it before you reinstall it. If you hear you tank hiss when you open it, check this line first.
The last pic is the 'after'.... I personally don't understand the comments on 'how do I fill this void?'.... It's not a 'void', it's a place that no longer has an ugly plastic box. Being able to see the forward cylinder including the magnesium cover looks great. Next step will be the horn relocation.
Disclaimer: I have neither done, nor condone/recommend that anyone fiddle with any of their original emissions equipment.

And hey, where did all my cool frame stickers go??!
Mike