It depends on how Moog-like you want to get, I guess.
Emulating analog circuitry may not be required to get a passable model of the characteristics of an analog synthesizer. While your model may never get to sound exactly like a Minimoog, the filter for example can be modeled decently with a simple IIR design and even more accurately with a more involved models (the Moog model from cSound springs to mind: http://www.csounds.com/udo/displayOpcode.php?opcode_id=32). This is the topic of a lot of research, both independent and published.
Emulating analog circuitry may not be required to get a passable model of the characteristics of an analog synthesizer. While your model may never get to sound exactly like a Minimoog, the filter for example can be modeled decently with a simple IIR design and even more accurately with a more involved models (the Moog model from cSound springs to mind: http://www.csounds.com/udo/displayOpcode.php?opcode_id=32). This is the topic of a lot of research, both independent and published.