quilting out of the darkness

the darkness quilt was made for my brother nemo. nemo wasn't his real name but now it is. more about that later.
this quilt was used for years and has recently been returned for mending.
so now the idea is three quilts in one. this is my first experiment with what i will call extension quilting, adding one quilt to another, after all elements are already backed and batted and sometimes quilted. the reason i want to do this is because i am a commuter quilter and it becomes very hard to work on the middle of a quilt on the train. so i am finishing the center first and then i will add borders and edges one at a time so i can always be working near an edge where i can get my hands around things and not be sewing in someone else's lap. makes sense to me. and probably to "them" too.