ok so:
1)be sure your archlinux-keyring and obarun-keyring are up to date. The good one is core/archlinux-keyring 20170104-1 and obarun/obarun-keyring 20161209-2 repectively. Update it if it's not the case
2)remove the directory /var/lib/obarun/gnupg
3) initialize the key as follow :
run haveged first for entropy
haveged -w 1024
$ sudo pacman-key --init --gpgdir /var/lib/obarun/gnupg
$ sudo pacman-key --populate archlinux --gpgdir /var/lib/obarun/gnupg
$ sudo pacman-key --populate obarun --gpgdir /var/lib/obarun/gnupg
4)remove the package krb5-1.13.7-1-x86.64.pkg.tar.z and libpsl-0.16.1-1-x8664.pkg.tar.xz from your cache directory if exist. this avoid a crash during the installation.
5) finaly run obarun-install
about keymap :
please check if the file /root/.xinitrc have a this line :
setxkbmap us
By the way, i think all this trouble come because the ISO version is old. I'm currently working on pacopts to fix the bug about origin options (done yet) and to provide more features like installing package with cower. I need to work a little bit more on it and i make a new iso for openbox and openboxS6.