There is a pic in the photo of the day thread of a mega tarp with a bear paw nest in it, I personally use a Borah bivy with the bug net tied to my pole to keep it off my face. Works well for me.
There are no inner ties on the inside of the mega that I have.
The distance between the points for the trekking poles in the meg is exactly the same length of a Bear Paw Net Tent. So all I do is put the clip from the net tent over the trekking pole tip then into the mega's hypalon. I put four pieces of shock cord on the net tent, each corner. I stretch that to the corresponding stake on the mega, works very well. More floor space could be created by using more shock cord at other points but so far I haven't needed it.