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

2) Create the /home/username directories and subdirectories:

cd /home
vi make_dirs.sh

press 'i' to go into "insert mode" then paste the following script (right click)

#!/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;

Press "ctrl-c" to exit "insert mode", then press "shift-Z" twice to save and exit.  Once the file is saved, type:

chmod 755 make_dirs.sh
./make_dirs.sh