Yes, you can use your own domain for your personal/custom vhost.
Just point the nameservers to -
ns1.shellhosts.com
ns3.shellhosts.com
ns4.shellhosts.com
Then open a ticket in our Support system or by emailing support@Xzibition.com with the custom vhost you want to use.
Or if you control your DNS and can point an A Record, open a ticket in the support system or contact support@Xzibition.com for an IP and the vhost you want to use.