This idea is new. However, I don't see the point of it. Why someone would prefer playing this scheme over Kaos, Team17, Parachute Shopper or Bungee Shopper? This scheme has no remarkable 3.8 features, It could have crate shower, multishot, different gravities, different game engine speed... So it could have been created long time ago. About attacking from ground, there's already Attack From Ground Shopper by PoC community and some other schemes by Kradie.
And BTW: arrows on indestructible maps without teleports bothers me.