If your going poncho liner, give JRB a call, (Or get online) and get their DriDucks poncho w/ mod kit, They have already done the think'in for you on the best way to attach, etc...

Upside: Light and "dual use"
Downside: Costs more and isn't as durable as surplus
I believe everything's at JRB is on sale right now.

And your won't have that "Surplus smell" on your hammock. Threw mine out at the beginning of the year for that reason...