I have made numerous quilts but for some reason I am having difficulty with my new one. I am attempting a sampler so that I can try numerous different quilt blocks. I am only picking 8 inch patterns however; I am noting that my finished block size is 8 1/2, is this correct? is the extra 1/2 inch for the seam allowance? If it's not I really need to check my 1/4 inch seams, although I use a really good 1/4 inch foot for my husqvuarna. Thank you for any and all info!