Perhaps this was a special circumstance from a reputable builder on RC? I can see someone that people would consider an expert and has spectacular build quality could sell their DIY fixtures for a decent amount in comparison to the cost of parts alone but for us average Joes, I doubt it.
I hadn't even looked at the FS forum on RC, I was simply talking about some of the long DIY threads where I've followed the builder through multiple renditions of their light (as they sell each one to help pay for the next build).
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.