Ok, here is what I have come up with so far.
I'm shooting for 42'' wide by 52'' long. I'm thinking that I can have the baffles be 2.5'' and add an oz of overfill to the entire quilt.
I don't know what would be good for the temp range i'm looking for... I'm assuming 25-60 mainly. I know this is a huge range i'm looking at, but i'd prefer to do it with one underquilt.
Is 2.5 '' loft good enough? I figured with overfill it would be perfect to take me the whole trail.
This will be used with a 3'' top quilt, if that makes any difference.
EDIT: This will be a Southbound hike of the Appalachian Trail.