I have a 3 tier cake for next Sunday.  The middle tier is an 8" double barrel dummy.  I bought 2  4" high 8" dummies and will put them together.  Will the break between them show through the fondant?  I guess if I hot glue them together really well or skewer them or nail them together so they won't shift, the fondant would stay smooth. 

Also, can I cover it with fondant this weekend and store it until next weekend when I am putting it all together?  Or will it look "old" by then.  I'm trying to do this cake in small steps so it won't take all my free time next week.  I work, so I will be working on the cakes in the evenings next Thurs and Friday and finishing it on Saturday.  My hubby always says he "loses his wife for a week every time she has a cake."