Here is the back of the block:
[ATTACH=CONFIG]301617[/ATTACH]
And here is how the front looks with the overlap. This part had me worried until I joined two halves. This part falls into the seam allowance and is hidden.
[ATTACH=CONFIG]301619[/ATTACH]
As for starch, I was warned against it until all the pieces were joined. I remember someone mentioning that the dragging of the iron on the triangles with starch on them could distort them before they were pieced. I didn't personally need it, and was hyper vigilant to keep from stretching the edges.