I left room for caps. I can put a 1uF across the power pins and ... probably a 100nF across the output of the regulator. Need to leave room for a +5V for a switch feed.
Got me to thinking though. I would be taking the chip out into a breadboard. Maybe I should use the other half of the board I sawed off for a DIL socket ISP programmer for the chip.
The final idea is to put it inside shrink wrap to tidy it up.
The 12V wall wort is coping. It's rated to 0.5Amps and I haven't see these LEDs doing the FastLED demo reel pulling more than 250mA (based on my bench PSU). That would change on full white, full bright though. I'll avoid that.
Unfortunately the largest shrink wrap I have is just too narrow
Time to hit ebay.