Move to a better solution. I use Google drawings to assemble the memes, then use Krita to add special effects (motion blur for example). Other than that, take advantage that paint is disappearing and make memes about it, take advantage of the stocks.
You cannot build around a corner like that, as the wedges are equilateral triangles. What is missing in this game is a right isosceles triangle, that kan fill a gap between squares. Or allow you to make a square "sticking out" of your corner, rotated 45 degrees.
I understand your struggle. I suggest testing some builds on single player (with admin cheats), so you don't waste mats. Or you can use Google Drawings to make a layout.
unlike the other google programs, this one doesn't have a mainpage, so to see all of them you'll have to go to drive.google.com and search for drawings manually