Developing & building physiological multi-sensor devices as community projects?

The smartwatches Rob ter Horst presents are only of very limited use for medical and research grade applications: But what are the alternatives? The Schiller CS200 for 26 000 USD?: And the g.tec multi-purpose EEG headset for 50 000 USD? I have reviewed low-cost high-quality devices for physiology on my blog for many years. For …