Ronnie, that was the plan all along, mwhahah. just messing with ya dude. It's ok to vent, rock scaping can be tricky. And like a lot of us, it took us many times to get the rock just right.
I actually kinda like the first pic you posted, even though you threw it in, it has a nice shape, though its not practical. It does look like you have some rather large pieces. Maybe use two or three of the large ones and fit those on the bottom so they take up a lot of room but leave enough room along the sides around the glass. You will then want a few medium and small size to stack on those. Since you do have mostly all large pieces, you could try breaking them with a hammer, though I have never done it myself. If you do try it, be safe about it, cover your eyes especially.
It's too bad your LFS only had large ones. Worst case scenario, I would use only some of the big ones for now and maybe trade in the rest for store credit (if they will let you) and hope they have some smaller ones or maybe find another fish store that sells some. Other than that, maybe once you have cooled off give it another shot and see what you can come up with. I'm laughing at that piece of coral you hate, it looks something x rated. lol! If you hate it so much, trade it in for something better!
You can do it!