I'm trying to understand how you connected the wooden frames to one another. I see you have an additional board on each end that you use to screw in a frame and according to what I see, it appears that each frame end fits perfectly, but I tried it myself with a few pieces of wood and it doesn't fit flush like yours. Is that additional board the same dimensions as the lumber you are using or is a different size ? How do you get it snug and flush like that ?



