I made an 11' long by 8' wide hammock this past weekend and was able to use my 3/4 poncho liner UQ under it with no problems. I've not gotten any wider, just my hammock
and it actually sealed up better than in my ENO DN.
On another night, since it was colder, I tried my make shift UQ that I made out of PE floor padding, double layer and same results, it worked great and it also sealed up better than on my Eno DN. Speaking of which, that particular UQ I thought was a total failure due to its lack of sealing and this was it's last try before I was going to throw it out. Now I'm going to keep it as a back up for these wider hammocks. It's a bit bulky, but weighs next to nothing.
I hope that simplistic theory about me not getting wider and just my hammock sticks, as I'll be making our 3/4 down UQ as soon as my material gets here and I did not figure in making them any wider than the usual when I ordered my material
Just remembered...I hung both types of UQ off my hammock ridgeline with long prusiks, and not the ends of the hammock. There was not enough shock cord on them for that length of hammock.