Back: Player List
Start: Esc. Menu
A: Jump
B: Bricks
X: Tools
Y: Paintcan
Left stick: Move
Right stick: Look
Up: Move ghost brick up
Down: Move ghost brick down
Left: Move ghost brick left
Right: Move ghost brick right
Left bumper: Raise ghost brick by one plate
Right bumper: Lower ghost brick by one plate
Left trigger: Use microphone
Right trigger: Use button/fire weapon
Click left stick: Crouch
Click right stick: Zoom
The Brick Tool can be one of the items in the Tools inventory next to the Hammer, Wrench and Printer, not sure how you would select a brick though