As a bit of caution, if your not comfortable working with electricity, DONT. You could easily shock yourself or start a fire if you wire this wrong.
Thats a very similar unit. Most of the available units are not solid state. I will post a video of my build this coming week.
KingOf DIY/UrauJoey has a build for a unit rated to 1000watts using a stc-1000 that is essentially plug and play with multiple plugs built in. If memory serves me your trying to run 900watts of heat?