Speakers: The current 16-inch Zephyrus features 6 speakers(2 tweeters and 4 woofers where 2 woofers are sandwiched on each side).
Suggested upgrades: increase speaker count to 8 (2 tweeters (further up the speaker grills), 2 mid-woofer, 2 bigger subwoofers with additional sides slit cutoff to enhance the bass like maybe a passive radiator? (side slit cutoff like macbook pros))
Battery: One whole block of 90wh battery
Suggested upgrades: Few separate smaller block of battery(Like MacBooks)
