I've been playing a lot with google sketchup and figured i would share my progress.
So my next step is to build a model and then a prototype if it still looks feasible. I've designed this to use the REI halfdome tent poles as I can acquire them at the local REI.
If all goes according to plan, this should fit any gathered end hammock with a ridgeline of 110" or less with 48" clearance from bottom of poles to vestibule peak. Hopefully only two tie outs for the vestibule doors will be required to stabilize things.
I'll post some more pics when I've got the model completed. This could be a total failure, but hey, I'm having fun anyway. ;-)