I've done twin size quilts in 5" throat space, before I bought my vintage Singer with 7" throat space. Try to get your work space behind the machine and to your left as big as possible. When I was a teenager I had a tiny cheap Brother sewing machine (I loved it!) and would quilt at our huge 12 seater dinning table. Plenty of space! Basting every 4" on a grid helped me too. It's doable.
Marti Michell has written a book and published a Craftsy Class for machine quilting large quilts in small machines.
https://www.google.com/search?q=mart...=silk&ie=UTF-8 . It might be helpful to look into it.