Here is a successful project that had similar goals to what you're trying to do: https://www.crowdsupply.com/sutajio-kosagi/novena https://www.crowdsupply.com/

Here is a successful project that had similar goals to what you're trying to do: https://www.crowdsupply.com/sutajio-kosagi/novena https://www.crowdsupply.com/sutajio-kosagi/novena Be aware that hardware development is really hard (just look at the problems that the Open Pandora guys had).