How to create a deb file which installs Valve's OpenVR Package on Ubuntu?

Question

Ultimate Goal: Add ValveSoftware/OpenVR to a PPA so that it can be installed via

$ sudo apt-get install openvr

I'm assuming this means I need to create something like an OpenVR.deb.

Attempt: I have read the Ubuntu Packaging Guide which gives an extremely broad overview of how to get started, but it seems to assume a lot of Debian knowledge.

I know that the ultimate build command to run on someone's system should be as follows:

installOpenVR() {
    cd /tmp
    git clone https://github.com/ValveSoftware/openvr.git openvr
    cd /tmp/openvr
    mkdir build
    cd build
    cmake ..
    make
    sudo make install
    sudo ldconfig # OpenVR's `make install` fails to run this on its own
}

This at least will depend on autotools and cmake, so that the Depends: field in the control file should be adjusted accordingly.

Problem: From here's it's not so clear how to proceed. How does one create (or begin to create) an OpenVR.deb for apt to consume?