do you really mean a 10 1/2" Texas Star?
My searches all show a Lone Star type which is certainly not 10 1/2"
Or have I mis read it and it shold be a 101" with 2" diamonds. If this is the case then suggest you use Elearnor Burns Star block/book. Good directions.
If this is the case I believe it would a be a nightmare if many were working on a Texas Star as no two quilters (well rarely) piece the same.
If you want a star quilt you might consider Labyrinth. I have seen it mentioned here. However, it still is requires precision