Product child table under main image: how to do this?

Hi,
I have a web site using myStore template.
I have some products that have product child like this.

How can I show the child table under the main image using so all the layout space?
In the actual layout I have less space and so all the text in the child table are compressed and so the layout isn't ok.

Can someone help me?

Regards
monak1983