Hi ya'll, does anyone know if you can use cake mixes to make a topsy turvy cake? How hard are they? any help would be much appreciated..

absolutely! why not? There are other posts about cake mixes on here and what advice people have to make the cake more dense and easier to cut.

I do! I use Duncan Hines with water, eggs, sour cream and pudding mix. Chocolate and Vanilla works especially well. I find both bake up nice and dense for carving.

http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1444341
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1671066

Here are two of mine, one fondant, one buttercream. HTH!!

Yes you can! Here is a great tutorial:

http://cakecentral.com/cake-decorating-ftopict-587795.html

yes you can, I some times use poundcake from betty crocker mix in with
yellow cake mix and it comes out pretty good and stable