Is a description of product development work suitable for a journal paper?
Academic journals generally publish papers describing original research results that advance (or try to advance) a particular field of study.  Development of a product is not necessarily an original research result.


Does your design involve a new approach or technique that has not previously been used in the field? Does it represent a new way of thinking about a problem? Then it may be an original research result.
Is your design an application or straightforward extension of previously known techniques, possibly with some small tweaks and optimizations? Then it may be a great new product, but is probably not a research result.