Can anyone tell me how to do this structurally? This is a cake by Bonnie151. Thanks! I can get the cake central pic to post so here is a link to the website.
http://caketasia.com/#/fuschia-gerberas/4534898587

Thanks!

any ideas or thoughts welcome i have no idea how to support the box and the top tier

I think you would treat it like a regular tiered cake. Support dowels or SPS under the glass vase. It appears to have a piece of white plastic (that blends with the fondant) under the glass bottom so you would not see the dowels.

The vase would acts as the support for the top tier. The plate under the top tier looks like a cake drum wrapped in fondant.

HTH
Kristy

Thank you so much! putting the plastic on the box makes sense! I'm going to try a square of contact paper