I have this idea of a trail that goes from south american countires to north american ones, running right through central america too.

Does anyone know who to get lands set aside for this that haven't been claimed in any of these countries? Or how to ask the country to donate land?
Would anyone want to help link up existing trails to make a unified north-south one? this could be the GIS mapping or hands on digging or just social networking it.
Would anyone be interested / willing to help with the legal work of asking countires about entry / exit requirements being waived / funding and so on? (its kinda a long list of considerations .. )
Would anyone be interested in doing some of the trail creation???