yes, I meshed mine. If it helps, I have a video on what I did.
Putting Together & Altering The Living World Eco Habitat Cage | Cosmic Hamsters - YouTube
Yes, I have a male syrian in mine, but I used 0.6mm mesh so safe for any hamster species in the future, except for I would keep an eye on access to the ventilation holes. I wish they were at the top and not half way down.