Yes it would be a 60 degree just the same as a OBW. :D:D:D
Cut your strips to the height that you want, and then cut the 60 degree triangles. You can use the 60 degree line on any of your rules for this. I don't use a specialty ruler for OBWs I use my 6 1/2" X 12 1/2" all the time :wink:
2" and 1", so your strips would be cut at 2 1/2" and 1 1/2" I believe. Cut a couple out of scraps though, in case I am wrong :wink:
Edit* then measure the "bottom" of each triangle 1 1/2" or 2 1/2" and then make your 60 degree cut :D:D:D