What a beautiful, beautiful quilt! Wow, you must be so thrilled!
I might suggest that if it needs cleaning and you are able to wash it in a bathtub, you put a sheet under it. When you're finished washing it, don't pick up the quilt which will be heavy with water and could break some threads. Pick up the sheet, using it as a sling under the quilt. And if you decide to put it in the spin cycle, give it PLENTY of looseness and run it on the lowest speed. And don't even consider sending it to the cleaners, they have no consideration of quilt care. Ask me how I know...
I learned this from a quilt museum: Rotate your quilts no matter where they are placed. If you display it, you will want to do so for no more than 4-6 months. Then remove it and either place it flat on a bed or place it in storage for 4-6 months. In storage, always use acid-free cardboard tubes or crumpled paper to soften the folds to prevent creases and eventual thread breakage. Store loosely in clean cotton sheets or pillowcases; don't place in plastic as the fabric can't breathe.
You mentioned placing the quilt over a curtain rod? I suggest the rod be heavily padded as all the weight of the quilt will be on that one place. If possible, could you obtain a rack that has three round dowels for support rather than just one? That would help spread the weight of the quilt and prevent damage to those old, old threads.
I hope this is helpful
