now i do! 
I have done many of these, the hidden colunns can be cut to make a shorter gap between the tiers, it depends on the flowers you will be using. For larger flowers, like hydrangeas you will not need to cut them. I have found that taking wax paper and cutting it to fit the space you need works well, that way you can lay your flowers on the top of the paper so they won't touch the cake, you can lay them in with the flowers sticking out and then put in your greenery and babys breathe or whatever you are using. When they get ready to cut the cake, they just need to be removed off of the wax paper. The water picks make so many holes in the cake. I only use them for cascading. I always put the flowers on at the last, that way they stay fresher, they will hold up pretty good as long as it is not hot. You can pre-cut your flowers and put them in a short vase, that way you don't have to cut them all on site. I always bring a plastic bag to drape around the area I am working so the table doesn't get messed up, then I have something to put all the cuttings in. If the flowers are going on the top, I make a bouquet and use what the florists use to put the fresh flowers in, that way it can sit right on top of the cake. I hope all this makes sense. Good Luck.
I am assuming you are asking about the hidden columns? They will fit the wilton plates. Lets say you are baking a 12,10 and 8" cake. Your 12 will go on the bottom board which should be at least 2 inches larger then your cake. Your next layer which is a 10inch should be placed on at least a 10 1//2" board that is wrapped. That cake will sit on top of a wilton plastic plate that will fit down into the hidden columns. To properly measure, take your plastic plate and set it carefully on your iced 12" cake, make sure to center it, all you want to do is mark your cake so you know where to put your columns. There are little legs at the bottom of the plate to make your marks. Gently press down to make your mark. Lift the plate up and you will see 4 marks. This is where you will put your hidden columns. Hold the column straight over the mark and push the column in until it will go no further, you know then you have reached the bottom. Repeat with the other three columns. Once those are in place, set your plastic plate in the columns, lining up the little legs to go down inside. Gently push down on the center to make sure the plate is flush inside the legs. You will then place your iced 10' cake on the top of that plate, repeat the same steps for your 8 inch cake, except you will wrap a smaller board like a 9 inch, you will need an 8 inch plastic plate, or a 6" if you do not want the scallops to show. I think wilton has come out with a non- scalloped plate, you will have to check at hobby lobby or michaels.
Mark the 10 inch cake with the 8 inch plastic plate to make your marks. Place your dowel in just like the other one you did. If you are transporting this cake your can carry the cakes seperately until you get to the site and then put them on the plastic plates on site. I hope I make myself clear onthis, Wilton does have a section in the yearbook and describes how to do this. Good Luck.
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