Thanks for that info, Quindel. I'm not totally committed to originality--sounds like it might be too much work for not much gain. Do you have any recommendations for generic retro heaters? I am also "rustoring" a '46 Fleetline Aerosedan that I plan on driving year round (yep, in the rain, snow, and salt! I will wash it regularly--it's just a car) and will need a very capable heater for it as well. Thanks!