I think that's the best way to go. Go for the 3" pillars (the shortest available) but you'll need quite a few roses to fill the gap.
I have one like that in my photos. I used the Wilton hidden pillars but did not cut them and then just placed the flowers in between the layers.
Hope this helps.
Wilton also has a cake stand with one large pillar running down the middle of the cakes. That is what I used on these cakes....
As for how to assemble them, I put the bottom cake on the display table then the flowers on that cake, then I add the next cake and put the flowers on that one, finally the top tier and the top flowers. I did it this way because I was afraid of knocking a higher layer while putting flowers on the bottom - or muffing the frosting or something.
Good Luck!!
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