Graham bemethavinci
From your original drawing this was my version
http://baretest.xtgem.com/newblog
So far I have only made changes to the post list page the rest of the twig is untouched
This is just a simple layout using very basic bootstrap classes
fancy bits can be added later

I have added a twig routine to convert the standard xtgem pagination to bootstrap classes
And another to separate the image from the rest of the description