How to use this method to make 2-lines staff with top and bottom lines (size of normal staff)
Paging @johnkprice…
(I have a dim memory of your providing help with exactly this a year or two ago. Did I just dream that? 
)
EDIT: here’s a drop-in mid-thread that might be helpful: Specialized Staff/Staves: 2-, 3-, 4-line staff? - #12 by Lillie_Harris