With regards to finding costumers to help I have so far had someone with a Vader costume, and someone with a Scout trooper costume say they are interested in helping. I have also spoken to a few people in the US that seem to like the idea, but I would have to pass their information on to someone in the US to film things there. I'm still confident we will find more, it just seems to take time to get the individuals to come forward, probably because its a close community and I'm still very new. I am actually looking into making a costume of my own (an X Wing pilot) and joining them on an outing, so I can talk to them face to face about it, as I think it would be a lot easier to generate interest this way. I also know someone with his own camera who I am hoping I can get to help (though it will depend on actual dates quite a lot), and I am still hoping I can find someone else with a camera to help too as this would be a big help. Given that several groups of people are in the process of making fan films at any given time, we could just try to put a list together and contact them in the hope they could also add something for us to work with.
There also seems to be a group of costumers in the US who are currently filming footage for Adywan to use in ESB:R so assuming they intend to help in the same way with RotJ:R then perhaps we could contact them too? Just kinda making this up as I go, but given that camera and costumes are the two big expenses in something like this, and we know there are already Star Wars fans out there with access to them, then the more help we can get and the less we have to spend out ourselves the better. There are only two official groups of costumers in the UK and one seems to be ignoring my attempts to contact them altogether, but in the US there are dozens, so maybe if we could convince a few of the leaders of those groups, it would be much easier to spread the word.
I also find it has been difficult to get across exactly what we are trying to do, to people who aren't familiar with fan editing, and who largely don't see the films as in need of changing, so I was thinking some sort of trailer showing a few examples of what we are trying to achieve might help to generate a bit more awareness.