I have attached a file showing what I am trying to achieve.The red circle shows how I would like the end to look and the blue circle shows essentially what I am slicing away. I know I could boolean the shape away but I am interested in learning how to construct the shape from scratch. Basically what I am having trouble with is forming the correct curve on the back of the pyramid shape. I have tried to illustrate how the pyramid shape would not be made of straight lines but more as if you had sliced a section from the solid at an angle. (Such as seen in the blue circle)
If it’s not feasible that’s fine, I thought the skills I might learn may help on other projects.