You Definitely need a bigger gun!
Here are a few:
this one Jennifer Dontz recommends:
http://www.bigceramicstore.com/Supplies/ClayGuns.htm
HTH,
Jessica
Sorry hit enter by mistake.
The first one on that page Jennifer Recommends! She uses it in her video to make really long ropes!
Jessica 
Hey Amber,
Yes I do think you can do that cake with the gun! It will really come in handy, that is alot of ropes!
It does have an attachment for the ribbon, I dont know if it might be too thick though. You can always give it a try!
Jessica
At OSSAS, James Rosselle used the Makins green metal extruder and it worked really well. I had bought the cheap Makins extruder just to try it and had already tried to buy the metal one but Michaels was out when I tried. It was good to seem him use it and how easy it worked to create a long skinny rope that he put around the base of the cake.
I did make a ribbon with the flat attachment using even the cheap extruder. However, it doesn't hold enough fondant to make a long rope. I'm headed to Michael's today with my coupon to get the metal one. The cool thing is that it comes with all of the different disks that you can use also.
I purchased a Makins Extruder from this website for a great price!
http://www.polyclayplay.com/Products/Extruder/ProdClayGun.htm
HTH,
Jessica
The Makins one is smaller, its a great alternative to the regular black and red sugar gun you usually see! Definitely the copper one for big jobs. You could use the small dics from the makins one with the copper with an adapter I believe.
Jessica
The didn't have it. I tried to buy one as OSSAS but the lady in front of me bought the last one they had. I can't find the one he had online either, so I guess you're right, they don't make it. I wanted something bigger than the small barrel. Oh well.
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