so, you are making an 8x14 quilt??? just the silk panal?
(Not sure what you mean when you ask "are you adding silk to it?" I was just going to make a single panel of the silk. thanks)
or...are you adding cotton quilting fabrics to it?
that was the question....using cotton? using more silks? using some other textile?
if you use a stablizer (lightweight fusable tricot interfacing) on the silk---then add cotton fabrics- you could gently wash it if needed- often quilts made with silk & other delicate fibers are protected to keep from needing laundering---vacuumed (with a nylon or cheese cloth placed over the end of the wand & held up a little bit from the surface of the quilt)
cool water, dry flat- gentle/short cycle...or spot cleaned if needed & possible...but it all does depend on what fabrics you are using...just silk? as you stated above---silk can be washed==carefully
if you do a search of ---using/caring for silk fabrics you will find alot of information- and learn what to use & what not to use.