so basically i have the pain in the ass part done. ie cutting out squares/triangles. and its not quite as perfect as i would have liked but i managed to put a dent in my rotary blade by running over a button. so now its fucked and i need to buy a new blade but too lazy.
and now the obvious but captioned progression:

triangles

squares

rectangles

done. sorta. it is currently 53"x28" which is an awkward size to say the least. i plan on adding a row of white squares down each side which should bring it to 42" wide. but umm like most of the crafts i do.. it started out with a sweet idea and kind of petered out towards the end. better luck next time right?