Thanks for the reply. I was thinking since I'm such a novice and there's going to be a lot of me asking question after question, maybe this thread would be better suited elsewhere? Just a thought, I don't want to waste anyone's time.
But, I digress. Here's why I'm confused. This is the part from your drawing and I didn't have anything else to do so I fit it in. Had to enlarge the stringer notch in F7, I can always revert to the correct size quite easily. The plans I have says it should be made from 1/8". But, to me, 3/16" seems logical due to the stringer notches being 3/16". Is it really that critical?