The first problem is that Mendozite is based on T3V2 and Brisk is based on T3 so the underlying structure is completely different.
If you put /?tp=1 at the end of the URL for your website you will see all of the module positions and where they are assigned to.
If you want to change the bottom spotlight just to have 4 columns across you need to change default.xml located in templatesja_mendoziteetclayouts. I think that this is where the column widths are called from (but I could be wrong!)
Colours and styling can be changed in templatesja_mendozitecsstemplate.css just search for botsl and you can edit colours, margins etc.
Hope this helps.
Regards,