It's beautiful!!!!
I think it'd be totally do-able ... because of the delicacy of the crocheting, I'd keep it simple! simple! simple! .... a plain whole cloth underneath, so that the colour can come thru the crocheted lace.
Rather than making it a full queen cover, as you're thinking ... I'd suggest keeping it to not much bigger than what you have. It'd still be large enough to use as a coverlet on the bed (not a bedspread) ... or very useful as a day quilt for a quick nap!
Otherwise ... what about using it as a lace tablecloth for the dining room table?