Thanks for the input. I'm thinking that the use of eyelets and lacing may be the way to go, but I'll probably need to deal with water intrusion. What about using a seperating waterproof zipper?
Here's the first combine configuration. Also shown are triangular doors added to each end of the individual tarps. These could be mesh, solid, or combination of both.
The combined tarps now have an approx short diag of 127" and long diag of 178".
Here is an offset pup style ground setup.
Here's what the combined tarps provide if one is hung in the typical asym tarp pitch. The second tarp provides additional wind & rain protection.
Two tarp, single pole ground setup. This is the same as the previous, but the exposed end has been dropped to the ground .
Single tarp, ground setup. Door provides some additional protection.
Single tarp, pup style ground setup w/ doors.