Ok so have you done an energy audit in the house? Reducing your heating needs is a much bigger better strategy to pursue than devoting your time and effort towards effective feeding the heat gobbling. Leak sealer and insulation is an investment that starts paying back immediately and continues essentially forever.
That being said, if you are trying to go modular with your idea presented in the other thread, and want to go mad Max on the cheap, I would propose a few ideas that work good for me:
Ditch the cap tubes and use txv valves as metering devices. Surpluscityliquidators dot com is an awesome source.
Learn to size and wind helical "worm coil" condenser assemblies and use flare fittings at first. Flare nuts and fittings are common and inexpensive.
Look through a few build threads and start swaging and sweating copper tubing. Start out with safety silver solder and flux and a propane blow torch.
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