Nathan
I am not sure how Matt will be doing this as he may be locked down away from his tool base. Most people use an angle grinder with a thin (1mm) cutting disc. They cut through this thin steel so quickly that almost no heat is transmitted to the point that the cut edge can be held with bare fingers. An added precaution is to clamp the saw plate between heavier section steel to act as a heat sink. The top piece of steel acts as a guide for cutting too. See post # 8 in this thread for some pictorial idea of the process.
The plates can be cut with a fine (32ppi) hacksaw blade when other methods are unavailable.
Regards
Paul