I also am in an unfinished basement. My husband does cabinetmaking at times so he has a large table saw table which I use for putting quilts on it is really large and high enough for me not to bend over. I clamp extra wood on end to fit quilt.
I use a table about 28 " high to sew on and 32" to cut, although 36" would be ideal for me. I am tempted to move one of his tables down to my end to use for cutting.
I use an office chair to put the quilt on when quilting. I think that he may want to finish the area, but am satisfied with it for now, just wishing it was a bit warmer, but then summer comes and it is cool down there. Being Canadian, we complain of the weather at all times. It is bred into our DNA.