Thanks for the thoughts jmac.
My concern is, too, the gorge country heading up from just north of the Salisbury Junction. While we are as prepared as we can be from speaking to others who have come the same way, I believe most of the challenges will have to be viewed by us in person before overcoming them or coming back at a later date for another try. This seems to be the nature of adventures that haven't been done before!
Agreed, 24 days seems overtly cautious and you are right in that the quantity of food needed to supply us for that time actual lessens the gap between the expected time and the allowed 24 days. This is something we have taken into consideration, based on the idea that time taken is also impacted on by other factors than packweight - such as river levels, poor weather, etc., and we'd rather have the food just in case. Let Ray Jardine scorn me.
We have also considered a number of escape routes, each at different points on the trip. The SCT is an escape route for us up until we have passed the Salisbury River, then Bobs Knobs/Lake Sydney/Farmhouse Ck up until we get through the New River Gorge at Gibraltar Ridge. Between Gibraltar Ridge and the creek that comes down from Satellite Lake is a section we have to commit to, for all escape routes out of that particular stretch seem tortuous. After that, the Crest Range provides the last escape route before we reach our goal of Federation. Turning back is of course an option depending on the severity of New River Gorge. Our logic is that if we can get up through it, we can get down, especially as at that stage (between it and the Crest Range) we will still have enough food to wait out changes in water level. Severe events such as a broken leg will be covered by our extreme last resort option, the SPOT (satellite transmitter - essentially an EPIRB) that we are taking. Though ideally we'll try for self-rescue first in all but the most serious of incidences.
There is of course an element of risk still involved that is inherent in most outdoor activites. I'll let you know how we went when we get back.
Cheers