Thank you for sharing your journey of making this quilt. I understand your concern about quilting it on a DSM. I recently did a 60 X75 bargello on my DSM. It went quite well. If it were larger I would do it in two sections and join them. I have done that successfully in the past. Marti Mitchell has a book and instructions that are easy to follow. Good luck on the method you choose and keep us poster. Your quilt is beautiful and the colors so pleasing together.