New Game Mode Idea. Tank only Game Mode?

SKIP THIS PARAGRAPH IF YOU JUST WANT TO SEE WHAT IS HAPPENING. I was thinking about the rotating game modes Dark Star and Hunt of the Blood Moon. So i thought to myself, how about a tank game mode! I love those long fights where two tanks repeatedly bash their heads against each other until one retreats or dies. Those fights where two super tanks could fight for 5 minutes, their grasp healing for almost all the damage the enemy deals. That is a game mode I want to see. I think a lot of people would want to play this game mode. Or maybe I'm just crazy.

Rules: An entire new map, 4-5 lanes and maybe a jungle.(?) The game should get people into big items faster than a normal game. 30ish minutes is a full build. The game should make it rewarding for split pushers and for small skirmishes. The items should be limited to tankier items although some small dmg items should be left in. I'm not sure if there should be a limit to the champion pool because since people will be forced to play tanky it will be much more rewarding to play a tank.

thanks for checking this out, i think it's a cool idea but please comment and vote to show what you think.

Also I forgot to write it but if you think it should be changed, please comment below! and I can't edit the poll. Thanks for reading