Since it's a school day, Billy won't be there until some time in the afternoon, but he's eager to help out anyway. He's not much good for the heavy-lifting bit, but his magic is definitely useful when it comes to taking on the odd jobs, so if anyone needs something quickly modified, moved, or otherwise changed and doesn't feel like doing it manually, he's your guy. He can be found either doing said odd jobs (assuming there are any), or just tucked in a corner out of the way, drawing up designs for the sign to hang above the door, on the door, inside, wherever Natasha wants it. Assuming she'll want it.

Yeah, he's not sure either, but he's trying his best. Bother him at will.

...Also if there are shirtless guys around he is totally watching. For... anatomy study. Yes.