I can do "for leaning purposes", learning is exactly what I'm trying to do.
Building on top of Matrix? Do you mean it'll be interoperable, or use the same protocols?
I gotta say I'm not terribly thrilled with Matrix as a protocol; especially their idea of E2E encryption is a bit... meh, IMHO, since it pertains only to the message body (metadata and emoji reactions are in plaintext) and it's honestly way too technical for average users, though the latter should be fixable implementation-side since it's mainly a UX problem.