Foam around speaker leads - great!
Anti-vibration foam pads for the board.
Liberal use of silicone to keep larger components from vibrating their solder joints loose.
Good bracing of the cabinet.
The not so good:
ChengX electrolytics in a no airflow environment. I get that it's a budget speaker, but would 105C Teapos be too much to ask?
Internal dampening looks a little insufficient to me. Wouldn't hurt to use something a bit more absorbent...