I'm diggin these cable ideas. That's what I like about this site - all the advice that makes you think outside your own little box.
Nothing big to report today. Didn't have much available time. I made this odd thingamabobbie which is a baffle for inside the boiler. It will force the hot air to the walls of the chamber where the coil is. I wasn't able to bend the tubing any tighter than the 6" inside radius of the boiler and I don't want the heat to escape past it and right up the chimney. Yep,those are steel rivets. The "legs"of the baffle insert between the coils to support it.
Tomorrow I should be able to get the boiler mounted.