The 99 is a straight stitch machine, singer did make a few zz like th a t, but only a few. They will have and end mount bobbin like the 15.
The little block is 4". It wasn't that hard, though I messed up and did not cut the light blue large enough. I want to try one that is 2" square finished. I used batiks for it. I find them the easiest to work with for t h e tiny peices. I did it the same way I did the roses, sewing and then trimming seams.