Thanks for your comment!

You're editing the actual blockchain code right?

Yes

What will it take to get this code running? HardFork? Replay?

Yes. It requires a hardfork because we are changing the consensus rules. And requires a replay.

If it gets funded how long after do we think it'll be usable...

The code is not too extensive, it can be done during the month. The final implementation depends on the witnesses (for instace, they probably will wait the SMTs to make only one hardfork)