This seems like a very special project, and take it from me that large quilts can take more than a month to make if they are an easy pattern. I've always loved the wedding ring quilt, but perhaps you could start with just two interlocking rings as a throw pillow - you should be able to get that done in time, and done well rather than throwing something together and not being happy with the finished result. This way you can also enjoy the process! Congrats!