1. Sure, see attached STL file for the fan shroud. The hotend cooling fan is a Noctua NF-A4x10 5V. The part cooling fans are stock Ender 3 part cooling fans for 24v. The hotends are the original DXU ones.
2. That Meanwell UHP-350-24 has 350W. Plenty of power for the headed bed and two 40W hotends.
3. Those are BMG extruder clones from Amazon with "pancake" style stepper motors.
DXU Alternative Fan Shroud.stl