I'll include a picture that I hope explains how I made the blocks. If it still doesn't make sense, please let me know.
As to how I put them together, I did them in rows, so that I could iron all the seams in one direction for one row and in the other direction for the next row, so they would nest. Because there are so many seams, there is quite a lot of give so you can "ease" the seams to match quite easily.
Then, I split the entire quilt into three sections, so I wasn't handling the whole thing at once and put the three sections together at the end.
Clear as mud?
Watson