For the angles on parts in the first drawing, I draw in a flat plane. For example, Start with a 3"x5" rectangle. place the hole as required. For the 'rounded bull-nose' on some of those last parts, I used the same center point as the hole, and drew a second circle, to the desired size, then drew lines of the material I wanted to remove from an edge, to a tangent point on the larger circle. Then erase all lines that don't consist of the final, outside edge of the part.Then with the 'push command' I push it to the desired thickness. In this case 3/8". It's really tuff to describe, but the key is do all your drawing like you would on a flat piece of paper, before you push it into 3-d. I'll e-mail you that first drawing in .skp, and you can play with it. ~Scotty