Originally Posted by Valloric
You are free to do so, but this is rather unnecessary. Making a deb with checkinstall is useful when the install process puts many different files in many different places. Sigil's install process installs only one file: "sigil", which is placed in /usr/local/bin (this path can be changed, see the build instructions for more info).
The advantage is that of using the distribution's package system, which means you have a centralized database of installed packages, a centralized way of installing and uninstalling, of querying the version installed, etc.
At the moment you may have a single file (which I just copy in ~/bin, by the way), but later on you may want to install man pages, samples, templates, HTML help pages, command-line helper apps... It's a good practice to use "sudo checkinstall" rather than "sudo make install".