If you read the question title, the question is pretty obvious....are questions about modifying the hardware of Android devices on-topic on this site?
I would say not. Hardware modding doesn't really have anything to do with Android the platform, and would generally be generically about cell hardware than specifically Android hardware. It also doesn't match the expertise of most of our users.
From its topic description, the Electrical Engineering SE might be host to a subset of such questions.