Microsoft Active Directory using cPanel for non-Microsoft DNS?

I'm a volunteer at a museum and am trying to set up Microsoft Active Directory using an on-site system running Windows Server 2012 R2 as a domain controller. There is a broadband connection to the Internet with a single static IP address. DNS for our domain is provided by a hosting service which uses cPanel and our hosting package includes 10 sub-domains.

I have been reading /http://www.manning.com/siddaway3 Learn Active Directory Management in a Month of Lunches. Chapter 15: Managing DNS suggests that it should be possible to use a non-Microsoft DNS to work with Active Directory. The book states that:
A non-Microsoft implementation of DNS has to meet the following requirements to support DNS:

• Must support SRV records
• Should support dynamic updates
• Should ideally support incremental zone transfers

It appears that an _msdcs subdomain is required to provide an externally visible source of information to locate the Active Directory Domain Controllers (just one initially). The DNS configuration for the _msdcs subdomain should be simple and static, consisting of eight SRV, one A and one CNAME records.

Has anyone else done this successfully? Can anyone point me to a simple step-by-step guide?

Unfortunately, I don't have direct access to the cPanel interface myself. The person who does tells me that it appears not to accept _msdcs as a valid subdomain name.