I'll just point out one thing when soldering large portions of tubes to copper surfaces:
Soft solder (or whatever its called in english) has usually poor thermal conductivity, which would make the solder itself the bottleneck in heat transfer between the tubing and the copper plates. On the other hand, silver based hard solders with good thermal conductivity require more heat to melt and are difficult to work with.
Its not impossible, but it would require a good craftsman and good equiptment to do the job right.
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