Hi Kyle, Thanks for the answer.
Yes, I'm modifyng the theme as you suggest.
Well, nothing to do, I understand the product history, it will be awesome if maybe there is a new aproach for later versions when the base theme use <div> instead of tables to layout the structure of the site, nothing to say if it uses a css framework, not suggesting to use bulma css (which uses flexbox), but at least an old version of bootstrap (3.x) will be easier in terms of redeability, compatibility and maintenance. I understand it is a time consuming task to change all the template structure, but +1 that it worths.
Have a nice day !