After having a closer look, check the polarity of the battery. The jst connector shows opposite as what it should be. Red and black should be swapped. Some batteries come with the jst opposite of what adafruit uses. This would explain why it works with USB power. But not battery. Image for reference...

Do you have another power boost to test to make sure it isn't the problem?

I guess try removing components 1 at a time. And see if it powers up. Might narrow it down to the problem component.

Not currently. The CPU of the Pi isn't pointing at an aluminum surface. I've mostly ran Pi 2 & 3 versions with other projects, never played with the Zero that much. Does the Zero get hot enough for a head sink? Depending on the casing, (i've seen 70ish celcius in gameboy zero builds that I have mea...

The powerboost should be able to handle all of those components. The only thing I first notice is the power strip. Each of those circular pads is individual, and they are not connected to each other. So I assume you have the 5v and ground from the powerboost to one of those pads. That 5v/gnd stops t...

looking forward to seeing some more progress on this. It looks amazing! Will the case act as a heatsink as well?

You could use putty and

sudo chmod 777 /directory/file you want to change

This should make the file readable, writeable, and executable by anyone.

I think you can do that to a single file, or whole directories.

As for cyberduck permission, not sure. You can also try using putty and editing the file with that.

Example. Connect with putty. Enter password and username. Type

sudo nano /directory/file you want to edit

Using the text editor, make the changes and save.

Also note. To add that gbz35 theme. You can installed it right from retropie. No need to manually copy. I believe if you go to the retropie menu, you'll see es themes. Go there to see a big list of ones you can install. Gbz35 is on the list.

Black is negative, red is positive. Should be fine to solder to those pads above the fan connector. I assume that is what they are meant for.