One of the first large quilts I made was using the backporchdesign template... it's acrylic... I even emailed the designer and she emailed right back to answer my question... it's been years, so I'm a little fuzzy and the templates are in the basement and I'm upstairs... (sorry) but the curves were actually very easy! I made a queen sized quilt out of batiks for my daughter and it turned out very pretty... Mine did not have the organization of the gray one , but was the same ida...
Have fun!