Design me a Product

Hi, I am an academic scientist. For a project we have recently had funded we need a small piece of equipment manufactured. We will probably need no more than 5-10 units in total, depending on their cost. We thought that it should be possible to assemble this using something like a Raspberry Pi unit.    The project is to look at stress during early life development in children. Infants and young children will wear a small device, ideally under the clothes, continuously for sustained periods of time, at home. Ideally this will be for up to a week continuously per child, removing for washing etc. However if data storage capacities and battery life do not allow for this we can remove the device each night and recharge/transfer the data if necessary.    The unit will be worn next to the skin, probably positioned on the child’s back so as to be as unobtrusive possible. Ideally you would deliver it in a small box, with the requisite wires coming in and out. We had thought to keep the package and the wires in place using some sort of nylon harness, to be as comfortable as possible. We will get this made separately.     We would like the unit to contain the following devices:   Definitely: 1 GPS 2 Actigraph 3 Microphone 4 Heart rate recording device (for the best signal, these would probably be connected to electrode stickers such as ([login to view URL])).    And possibly also (depending on cost/data storage capacities/battery life):   5. Electrodermal activity (also known as galvanic skin response) (again connected to electrode stickers) 6. Go-Pro camera 7. Body temperature    The microphone and go-pro camera would need to be above the clothes. I would have thought positioned clipped on under the neck of the T-shirt, directly under the chin, would be the least obtrusive.    For the Go-Pro camera we could easily work with the data at a lower frame rate (down to 2fps if necessary) - if this helps. For the other devices we can probably also entertain the possibility of recording at a lower sampling rate, to save storage capacities. Alternatively we can use another device for the camera, such as the Clip 2. We do not need any graphing software, or any software writing for the post-processing. We only need the data delivered as a file containing all the data streams, time-synched into a single file. Or time-coded so that we can do the synching ourselves. Our budget for this project is unfortunately fairly limited, so it may be that not everything we want is possible - so some kind of breakdown of how much each individual component would cost will help.    We also do not have very long - so are keen to find someone who can get to work on this straight away. Many thanks, Sam Wass