Really good questions. We aren't sharing the details of the technical design quite yet (but will have more to say as we approach first flight).
Regarding engines: our first prototype (1/3 scale) flies with an off-the-shelf GE engine. For the product airplane, we're taking an existing subsonic engine and adapting it for supersonic flight. (Sorry, I know that's vague—much more to say about this in due time.)
Regarding engines: our first prototype (1/3 scale) flies with an off-the-shelf GE engine. For the product airplane, we're taking an existing subsonic engine and adapting it for supersonic flight. (Sorry, I know that's vague—much more to say about this in due time.)