Zpacks Solo-Plus Tarp with Twin Size ground sheet.

It works well. I have the Solo plus tent, with the twin groundsheet. Dimensions of the ground sheet fit perfectly under the solo plus. I know you have the tarp version without the netting but i doubt there would be any difference. No pics on hand unfortunately :(

Jacob

" It would also be nice if the wife decided to come along as we could both fit under the tarp."

Well, since I know you are a loving and caring husband, and will give her the front side while you slide under the sloping and typically wet low side, everything will be just fine.

One of the things I was wondering is what Greg was talking about. How much space will there be betwen your head and the sloping side? Would there be enough space to lay on your side or would you have to sleep on your back in order to not touch the tarp?
Thanks,
-Eric

As Jacob said, the double groundsheet fits fine – the Solo Plus and the Twin have the same footprint.
My wife is about 5'6" and she fit in the back of the tent but with little room to spare. In bad weather she had to be very careful not to move around too much. When ZPacks came out with the Duplex, it was the first time she agreed to a gear upgrade with enthusiasm!