Great work!
Just a couple minor points, not meant to criticize your work in any way...
$6 for a resistor in series with dimming pot, should be pennies, must be a typo.
Bridgelux EB strips don't need a heat-sink at nominal current.
Thanks for the feedback! I just linked the first pack of resistors of the correct values I found on Amazon. They can certainly be had for cheaper locally or via digi-key or similar. If I get the time, I'll see what digi-key has to offer instead and change the link.
I added sinks for the EB strips since each build runs them at 75% of max rated current and it made more sense to me to stick with the heatsinkusa sinks throughout the entire article, rather than deviate in favor of aluminum channel for only the EB strips. When you say nominal, which value are you referring to for the EBs? The data sheet shows 700mA and 1,400mA max for the 1 and 2/4 foot strips, respectively.
Also just added 1-foot versions of the 2x2 and 2x4 space builds in case the 2-footers didn't fit in people's tents. Just have to do this with 2-footers for the 4x4 space builds now.