"Do It Yourself" airborne proximity warning device

Thank you for your responses!

I've exhaused my spare time slot today for answering on e-mails.
So I'll leave my comments on this thread later on.
But for now I would like to remind you that:

- it is up to a human being to build an item himself(herself) or buy a product from reseller;
- it is responsibility of Pilot-in-Command and nobody else to carry onboard anything he(she) wants that is within w&b limitations and allowed by law;
- it is responsibility of Pilot-in-Command and nobody else to operate while in flight an electronic device or keep it switched off.