If you have space in your house where you can leave the WIP, there is another possibility. I am working on a tapestry which is about 48in wide and maybe 30in long. I had an old-fashioned wooden tapestry floor stand which was revamped to take the length of the design.
Two long 1in diameter dowls (or broom handles

) with holes drilled in the ends make up the upper and lower frame. The holes allow screws and nuts to be attached to the original side pieces of the tapestry frame. To make the whole structure secure, a piece of wood was secured at the bottom between the "feet" of the original frame. It ain't purty, but it do wurk.
There are several possible ways to attach the fabric to the dowling: simply wrap it around and stitch it (making a sort of tube into which the dowling will slide) ; or staple it to the wood, having first secured the edges with masking tape. In either case, you will be able to roll the fabric around the dowling as work on the design progresses.
When I'm not working on the tapestry (more often than I can to confess), I cover the whole thing up with an old curtain. (Which also says more about me than I care to confess.)
