I understand your problem. We live fulltime in an RV so my space is also limited. When I finish a quilt top, I wait to sandwich it when I can find a place with large tables. You'll be surprised when you start searching for a place to do this. Just keep looking and asking. Something will happen. I've tried "quilt as you go" but I'm not pleased with all the seams on the back of the quilt. Also, it's necessary to quilt each block and you have to stop 1" from the edge of the block in order to sew that block to the next block. Good luck with finding a place to sandwich the quilt! Just don't give up on finding a place.