To trust or not to trust in a item built by yourself?
This is a question that has no a simple answer applicable for everyone.

There are numerous RVs, Cubs, Velocities and other kitplanes flying around us.
Majority of the aircraft's structures had been built by the owners themselves.
The aircrafts have received airworthiness approval from government agencies.
A pilot of such aircraft trust his(her) life to the self-built airframe, wings and controls
which are primary, life-saving elements for 100% time of each flight.
In some countries supplemental live-saving equipment such as pilot's emergency parachutes or
a ballistic recovery system are optional, not required by air law, for this experimental
category of aircrafts.
And majority of aviators worldwide treat these facts as Ok. How EAA driven Oshkosh Airventure
and Lakeland Sun-and-Fun will look like if there would no experimental aircrafts?

Sailplane pilots operate their aircrafts under visual flight rules.
Primary and most essential instruments for maintaining situational awareness under these rules are the pilot's eyes.
Any electronic aid designed to serve this purpose is considered as supplemental.
Regulations states that you should not 100% rely on indication of a supplemental aid.
Taking this into account how it is important if the aid is a "factory built" or built by yourself?

For those who already had an experience of building an electronic device with success
my advice is: use this project as example then do your own hardware design of the device
that you personally can trust onto.