A MAG12 prototype has already been made and will be tested next week. It is basically a LAB12 that's been machined to accept a shorting ring and steel added to the core to maintain flux levels. If it meets specs, we will be able to go into production immediately. If not, Eminence will make a second prototype that has the shorting ring in the plate, allowing for a larger cooling vent. However, this will take longer to develop and may cost more, so we're all hoping the first prototype performs well.