MrOcket

No you are thinking, foot steering is the way to go as it leaves the hands free to deal with Sheet Rope and cameras 'n' such like.
If you are going to build I would suggest that (After having had a closer look at the Plume site) a LLF would be a far simpler built as the rear axles are a detachable affair and the front steering and wheel could be developed to be the same. The seat can be built from fiber glass and Ply. The wheels are cheap enough if you look around. To my eye the disadvantages of building a plume are all the extra trussing and reinforcing. I suggest that having the Mast Step as high as they do will reduce the efficiency of the sail by raising the center of effort.
Designed correctly I don't see why a LLF should be much over 4' long fully packed and ready to travel..
Paul/landyacht have you given a design for this purpose any thought?? Most people can do Roof Racks but a trailer is another Ball Game..
Ron
PS; Looking and thinking on it, I think a LLF could be more compact when folded for travel.