Looks like things are coming along nicely for your project.
How are you going to be funding the project to pay for the physical premises and the construction of displays etc? Have you looked into local or government community project grants? I know there are grants available for local art, culture and other projects, so you might be able to somehow fit your project into the criteria of one of those. Or even somehow link into the Science Museum.
One other thought I had was in regard to support material. You could try to approach the original developers/inventors (if still alive) of each machine to see if they could offer some input into the displays and content of the museum. Interviews with them, concept drawings for the original designs of the systems etc...