Hello everyone. I'm planning on making my own wedding cakes to save costs and also for the fun. I plan on making three spheres and stacking them as in the attached picture. To make it stable I plan on using three fake half sphere bases on which the cakes will rest but I am at a complete loss as to how I can stack them on top of each other??? I would really love some advice. I'm not a professional just someone who bakes for fun! Thank you!!!

www.pinterest.com/search/pins/?q=topsy%20turvy%20pvc%20cake%20stands&rs=typed&term_meta[]=topsy%7Ctyped&term_meta[]=turvy%7Ctyped&term_meta[]=pvc%7Ctyped&term_meta[]=cake%7Ctyped&term_meta[]=stands%7Ctyped

You will probably have to get creative with PVC water (food safe) pipes.

y'know what you should do -- make like the top tier cake and you can cut that for pictures -- do all the rest in foam -- cut yourself a break and just bake up some lovely layer cakes to serve to your guests-- put some grand marnier splash -- whipped cream and strawberries -- they'll never stop talking about it --

best to you

The structure could be done relatively easy with PVC and fittings, as yortma suggested, but like -K8memphis, I agree you should make the cake from dummies and make only the top 1/2 sphere cake for pictures.  Consider how much trouble it would be to disassembly this structure for serving at your wedding.