First, an AMAZING map!! Entertaining theory also. Given that the event would have occurred at the very earliest stages of earth's formation it's going to take some doing to find evidence. BUT there was a man who postulated the land formations in Eastern WA State were formed not by erosion but by a massive flood. He was laughed out of the Geologic Society. Not until flight was possible did geologists realize he was correct. Now they know it was not just one flood but a series of floods.
The fluid nature of the plate movements and what happens to those large chunks as they either move down into the earth or fracture up forming new peaks is exposed as we find new ways to detect elements.
Things to think about.

I didn't know that . Thanks for the info.

It's possible, but from what I've read the collision wasn't a direct hit..

According to conventional versions of the theory, the collision caused total melting of the earth, so that no crust remained and a solid crust only formed afterwards, so there would be no mark left. Also, the Pacific ocean is thought to have been formed by plate tectonics, only after the break up of the last two super continent events and is therefore much more recent. The volcanic activity around it is usually regarded a proof of its recent continuing growth.

I think though, that there is a hidden agenda behind this question.