Hi Matty,
All the bits are available from Jaycar in Canberra, just have to "stick em" together. Couple of images of a dew heater element being made and a complete dew heater contoller and heated (and illuminated) 50mm finder. The controller has a 10A capacity. Your 8SE will need about a 15W heater for the front corrector so the current drain will be a bit over 1 amp at the maximum heat setting.
If you need a hand, send me a PM.
Cheers,
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