The design is nearly finished, any last changes will probably be done once the initial print is put together. I am hoping to reuse some of the threaded holes on the extrusion for mounting the return spring. If that doesn't work I will have to come up with some sort of solution which shouldn't be too hard. 

I need to wire up the components and start working on the code. Hopefully I can steal from other people's code used for similar projects I have made.