Your design shows 2 equal columns under the head and you can attain this with the cart by eliminating one of the 3 that are available throught he admin > config > layoutsettings > and either right or left global.

While there set the remaining one to a width that will be half of the available space
This should get you on the correct track

BTW: The shop link is broken

Update: link connected and you do not need all the tables that you have entered if you follow what I have outlined