I am really not an expert yet on this but I would think, and based on what I have learned from this site, that you would stack/tier, etcc. just as you would a buttercream cake.
I know you can do a search on this site. There are some great threads that explains the whole process.
http://www.cakecentral.com/article23-Teired-Stacked-Cake-Construction.html
Here is the link that will show you how to do it! Pictures are included....it should help a LOT!
You cover your largest cake first. Then push one dowel into the cake and mark where the cake comes up to. Remove and then cut all four dowels the same length. I usually leave just a tiny bit longer than the cake so that the weight of the next tier doesn't make the lower tier bulge. Place in cake. Then cover your next cake [Here I always leave a little extra around the base so that when you place onto the dowelled cake it will cover any space] Smooth the join well. Then do exactly the same with the top tier.
I prefer to ice as I go so that the paste is still soft when you stack and you can get a really smooth join that way.
Hope this helps a little
I prefer to sugarpaste mine as I go as mentioned above.
No I never put a dowel in the top cake and I never have the need to put a really long one down through the centre of all cakes either.
You can have all your cakes wrapped and then stack or wrap as you go. You can put a dowel rod through all the tiers ONLY if you have a topper that will cover the hole. If you don't want the hole, put the center rod in through all but the top and then use royal icing to glue the top on and it shouldn't go anywhere.
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