Variable Length Linkage - swivelling

This is another late 2013, early 2014 model which I likewise touched up a little before uploading to grabCAD. I'm not really happy with it at all and if I were to model it over again now I'd do a lot of things differently. The modelling is pretty sloppy and untidy compared to what I'd be happy with today but I thought it's still worth uploading nonetheless. The model is of a conceptual design of a linkage where the distance between the endpoints remains approximately constant in the one plane even though it varies in another plane. Envisaged this being used for wheeled vehicle steering systems, as steering rack tie rod end. To avoid bump steering, when used in conjunction with the 'Vehicle Suspension Concept' design, which it is intended to be used together with.