I am looking for plans that will work for a hand pulled rickshaw. Something (functionally) like these: http://voyapon.com/rickshaw/ Unfortunately, I haven't been able to find any, but I think this site could have plans that could work with some modifications. I'm going to be using it at campsites, so I need to be able to pull it over uneven ground, maybe with 2 passengers. So I'm looking for something that could support at least 500-600 pounds. The Loderunner looks like a promising candidate. Although I think larger wheels would help over uneven ground. Any recommendations on where to start, or which plans would be best suited for adaptation?