Re: ladder for foundationless start?
I would suggest using your drawn frames as guides to help the bees draw straight comb in your foundationless frames. One drawn frame on each side of undrawn foundationless. Otherwise you'll more than likely end up; with a willy-nilly mess. Don't ask me how I know!
Then as they draw the foundationless out, you can move the large cell comb wherever you wish, until you eventually remove it.
"If all you have is a hammer, the whole world is a nail." - A.H. Maslow