Working the final details out for each of the full blocks was easy. 1/4 inch graph paper was used at full scale to mock the blocks up in true-to-life size. Pieces of graph paper were taped together and cut to size to get a feel for the finished size of the block. Squares in the various planned sizes were cut and placed on the paper block in various configurations to determine which arrangement appealed to Peter most. Since there were only a few arrangements under consideration, once it was decided, all 5 of the mock-ups were labelled with the finished size of the pieces plus seam allowances.
I did not bother with calculating fabric requirements since a generous quantity of manly fat quarters (34-ish?, or about 8.5 yards) has been waiting for the project to begin, along with a good length of shot cotton for the background. Quiltography calculated the requirement for background fabric at 7 yards and there are 6.5 yards available. The app appears to calculate full blocks for the half and quarter blocks on the edge of the design, so I expect at least 1.5 yards of the background will be leftover. The cutting directions for each set of blocks were really easy to determine, especially since all of the shapes are rectangular and regular.
I am excited about the possibilities and can hardly believe this idea is really coming to life. To the cutting mat!