I have an idea to build a scale(ish) model of the Curiosity rover for use on outreach. It should fit in a transit van between the sheel arches and be awesome.
I have had a chat with the current UKSEDS president about it and he thinks it could be a good candidate for the project fund which they now have.
The idea is to make it controllable over local wifi via a web app which students/people can control at a table (in outreach mode it goes rather slow). The body is modular and allow science modules (think robot arm, thermal camera, etc) to be built and attached. These connect via a local bus and are also made available over wifi (another port) whcih can be interacted with via another page of a web app. That way we can simulate missions with a science officer and navigator etc.
The construction is from 10 wheelchair motors (6 for power, 4 for steering) and recreates the full rocker bogie structure which makes these robots so cool. The magic ingredient is a transaxle from a mobility scooter in the middle which allows the rocker bogie to work (essentially there has to be a differential between the two sides). The body should be made of something like aluminium x-frame or Bosch rail - something modular which we can slide the science modules into and bolt in new things. The rockers and struts for the chassis could be made out of carbon fibre or more aluminium.
There is a possibility to make it ride on (not for public!) but this may reduce it's use with the science instruments depending on where they are put. Either way there will be a full speed mode (and I'm sure you've all seen how fast electric wheelchairs can go!).
Comment below if you're interested and we can start making a bill of materials and get a rough cost. Also, we need to find some MechE members ideally to think about the framework and the bearings.