Lovely blocks Judy - My narrow borders are not quite 1.5ins, I was working on the fact that I sized up the blocks by 1.42% so the border should be the same. But then I am doing Aie's layout, so I couldn't change them much or the outer (big) border wouldn't fit.
I cut them 2in wide, and sewed a good quarter inch in the seams, rather than a scant quarter in.
When you are doing on point, then the world is your oyster with layouts and width of sashings, borders etc.