I use the icer tip so you don't get so many cake crumbs cause most likely you will have to carve it...Then I smooth it out the best I can...borders and flowers hide alot...
Hi, if you make the 90 like this way (the 80 in the photo), it will be easier to cover the cakes in fondant.
http://www.venuscakes.com/blog/wp-content/themes/venuscakes/gallery/80cake-01.jpg
Don't cut the circles out from the middle.
HTH.
Oh...Duh.... 
I should have read closer..You want to cover in fondant...
If it already has the holes, cover the cake first with sugarpaste and then cut around the hole and take the sugarpaste out. Then you should be able to see the cake inside. Take another colour and roll out a strip and cover te inside the hole. You might have to measure the height. Then to cover the seam, do a boarder. Hope it make sence.
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