Unless we are vocal about it I suppose tf2 team may just slip through this and the practice of them not including appreciated custom art may continue.
The cheese and snakes were nice little features of cp_snakewater and as such they must be kept in.
I commend to submit tickets to them http://www.valvesoftware.com/email.php?recipient=TF+Team with demand to
Update cp_snakewater to include custom art chojje has created for it in the next update.

Rip snakes and cheese );

Some of the surfaces are non solid for explosives. I haven't checked extensively so there might be more. https://youtu.be/_yL1w8xk9Ls