Writing and publishing a technical note about an R package I prepared a developmental version of an R package specific to my field of study. Now I would like to encourage more people to use it and contribute code. My plan is to release a technical note describing the package in a field-specific journal. MATLAB is dominating my area of research so I don't think that usual R-specific channels (CRAN or The R Journal) would be appropriate to reach this scientific community.

However, I could not find R-specific guidelines to releasing technical notes about R packages. This relates not only to this particular journal but scientific journals in general.

To be precise, I would like to know: 


it is a common practice to write a technical note about a package that's only available on GitHub (no CRAN version yet) 
at what stage of development the package should be so that it can be
written up as a technical note
are there any guidelines to publishing technical notes about R packages


Can you think of any other considerations to keep in mind?

Thanks

I am aware of the submission guidelines to The R Journal but I think that my package is not aimed at the general public and it's at a rather early stage of development.

This question was previously posted on StackOverflow but the moderators suggested that I post it here.
Obviously you will need to do a bit of work to find the most appropriate journal for your field, but publishing an article about an R package is completely acceptable. In fact, "An R package for reading EPANET files" by Eck was published in Environmental Modelling &amp; Software which describes itself as follows,


  Environmental Modelling &amp; Software publishes contributions, in the
  form of research articles, reviews and short communications, on recent
  advances in environmental modelling and/or software. The aim is to
  improve our capacity to represent, understand, predict or manage the
  behaviour of environmental systems at all practical scales, and to
  communicate those improvements to a wide scientific and professional
  audience.