The curve at the left side and the sharper shapes at the right side had pieces of cardboard placed in them and taped in place so the half hitches wouldn't move down the warps. These were removed later and the warps carefully pulled through into the spaces to give enough length when they were cut and turned back. This was quite hard to do. Double half hitches were worked on each warp and these were turned back and stitched after the tapestry was cut from the loom and cardboard discarded.
A piece of foamcore was cut carefully in the shape of the tapestry and covered with a piece of stretchy black fabric. The tapestry was stretched slightly and pinned to the foamcore and slip- stitched around the edges into the black cloth.
It is so light it can be hung with two pins and a thread. It was photographed on a textured yellow-green chair but I thought this background looked OK.