How to make MarketPress checkout responsive

Going through my site and trying to make it mobile and responsive.

I am using a theme based on bootstrap, everything is looking pretty good. I was able modify the template for the single page based on editing mp_product.php, and that works pretty good....

I am running into some problems of customization that I am wanting to change, however wanting to know what to do short of modifying the actual plugin.

I noticed that the checkout process uses tables, not divs, wondering what to do? The way it looks now, if you checkout on a mobile device it looks very...awkward. I would love to have a cleaner consumer experience for checkout on mobile.

Thanks guys.