You might check the price of solder-on elbows and "T"s vs. Gerwin's all-compression joint setup. Soldering pipe is not difficult. You can use 50/50 solder for this non-potable application too - it's easier to work with than lead-free solder.
Why not play around with the design, make it both functional and attractive? I believe the form of such radiators non-critical.
Place it under a window if possible. The (usually) colder air sliding down off the window offers some natural draft and is of course the coolest air in the room. We place electric heaters under windows for these reasons.
Looking forward to your creation.
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