I would definitely be bolting that crossmember back in ... see if that helps some.
But even if it stays the same leave it in when you're welding that floor pan in.
Also check all your door gaps you might need to backup a few steps and re brace before you weld it in if AMD is correct on the firewall moving forward.
Lets face it it wont be ready tomorrow night , so take your time. " Haste makes waste "
