by the time you purchase everything and put the time into building and troubleshooting your own electronics, it would probably just be easier and cheeper to buy it already made. However, I understand wanting to learn fromt the project, as I am doing something similar, and like to do everything by hand so that I get the full experiance and knowlege. Let us know how your progress goes. Oh, and dont forget that any mosfet disipating more than one amp needs to be heatsinked in some way shape or form, and also, if you are not familiar with them, they are VERY sensitive to ESD, electrostatic discharge, 100 volts can destroy them, this is less voltage than is even able to be felt by a human at such low amprage, so leave them in the protective foam until you use them, and make shure you are properly grounded before you begin.