All good questions. I have belonged to a BOM thru my local quilt shop. The person that owned the shop gave us 3 choices. One was called Warm, then there was one call Cold, and the others were made with Bali pops. After a year of doing the blocks every person one came out very pretty and all different. The Warm and Cold she supplied the pre cut pieces for you to figure out how to put together. After 12 months you have all you BOM, then she gives us a Bonus one in case we wanted to do an off set quilt.
But I have the same questions on how much fabric we would need on these blocks, I am excited to work on houses.