So far everything seems to indicate the access point is working correctly on your raspberry.
as @zaanen said, having the contents of /etc/hostapd/hostapd.conf will allow us to have a complete picture of your configuration. In these type of configuration files the slightest error in even a single character might cause a problem, that;s why it would be ideal to have a clearer picture of it.
zxwt I set the country code with rapsi-config.
When using the notochord OS access point functionality trying to set the country from raspi-config should give you an error. Did you tried creating the countrycode.txt file as described here?
zxwt sudo rfkill unblock wlan
does not work
That's quite extrange, this command should force the WIFI to be active, even if no countrycode is set. Could you send me the output of the command ip a before and after executing sudo rfkill unblock wlan?
Changing the channel as @zaanen suggested will probably allow you to see the WIFI lan if you are in a very WIFI polluted environment. But you should probably be able to see the network anyway. Did you tried from several devices to see if the Chordata-net is at least listed within the available networks? (a PC, your smartphone, a tablet, etc)
