You can probably fudge some of the more technical details, but some key core concepts you can keep in mind are: 1) strength of emotions can amplify powers and directly affect the suits; 2) fire cores will provide better burst for fuel power; 3) water cores would be utilized for a cooling system; 4) air cores can also be used for ventilation; 5) a certain combination of fire, water, and air cores can provide a lot of steam power, moreso than just using traditional fire and water; 6) and then a lot of steampunk tech that could probably be modified to suit his needs.

Other than that, you're pretty much free to make up any alterations or schema you can come up with that utilizes those materials.