I believe that a boiler needs to be mounted at the reflective amplification point; which weighs quite a bit. This type has a small water flow and boiler point, where the work takes place and the pressure is small, but the heat moves to a hot water chamber where the actual water is heated The other modifier is the amount of steam each assembly size must be kept to a minimum for less shadowing during all focus period. Or the dual motor test of sunlight effectiveness; where the az and el is defined as the controller, which follows the sun every 2 seconds; which was Motorola (today it has been sold). Actually a part of Micros to Mains, the College of choice had many courses on these materials (with Moto or like MPU and CPU's; right along with nursing and Medical grade electronics.
But since they ask; it is a steam car too! The boiler then drives pistons and transmissions! Generators!