I've deleted /home, how do I recreate the directories?

Generally, this isn't the best thing to have happen because all of the data is stored there.  You'll need to recreate all of the directory structures, as well as a few files required for DA to run:

1) Create the DA tmp directory so you can log into DA again:

mkdir -p /home/tmp
chmod 1777 /home/tmp

cd /home
vi make_dirs.sh

#!/bin/sh
for i in `ls /usr/local/directadmin/data/users`; do
{
for d in `cat /usr/local/directadmin/data/users/${i}/domains.list`; do
{
mkdir -p /home/${i}/domains/${d}/public_html/cgi-bin
mkdir -p /home/${i}/domains/${d}/private_html
mkdir -p /home/${i}/domains/${d}/public_ftp
mkdir -p /home/${i}/domains/${d}/stats
mkdir -p /home/${i}/domains/${d}/logs
};
done;
mkdir -p /home/${i}/backups     

chown -R $i:$i /home/${i}
chmod -R 755 /home/${i}
};
done;
exit 0;

chmod 755 make_dirs.sh
./make_dirs.sh