Dude, I'm sorry to say this but I think you have made some big mistakes
The twin set up on a 5.4 goes on the top of the transom, not lower down so there was no need to cut the transom. Now with the extra weight you will just flood the boat, especially in reverse. And I would have thought that the engines will be at the wrong height.
There was another pic of the deck that had been cut down the middle, also not good dude, there is air tanks there.
The engines are over powered the tank is too far forward.
Sorry to bring bad news but someone has to say before you go any further.