It looks like this one will be a 8 or 9kbtu rotary compressor (scavenged from a window ac unit) rigged to a large outdoor coil. I believe it is from a 2 ton air handler, maybe 2 1/2 ton. If the included txv doesn't hunt, it will be run stock. If it does, I can swap it out for a smaller one.
Defrost will be reverse cycle, run through a cap tube. I'm going to start off with the one from the ac unit and shorten it if I have to. With a hot water cylinder as a heat source, I'm not sure how much flow I will really need in order to defrost quickly.
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