I am very excited to see your continued progress on this amazing endeavor. You have my prayers and lots of good wishes for your completion date. You have done the hardest part and I think most time consuming by drawing this out on your fabric. I love what I see so far. Super job!! In the past I have purchased 1/8" black bias tape a search should lead you to what you need. Tartan also had a very good idea using the black yarn.