If you want to have the cubes in it, why don't you use them in a border around the quilt. Finish the OBW's, square it up, put a small border on it which will finish the inner quilt pattern and use the cubes in the second wider border. The problem with this beautiful quilt is that the blocks make it look awkward and thrown together like two different unfinished projects. Each beautiful but not complimentary to the other. Please try another approach and I think you will be much happier with your finished product. It is your quilt though and it is beautiful as it is but it could really be a show stopper if you reconsidered those blocks in the middle of it. IMHO