It must have been 25 years in one of my high school math classes that I last saw the proper use of the abbreviation IFF.
As for the use of dovetails, a good finger joint is even stronger and very pleasing to look at if done correctly. They are very labor intensive, but only require a table saw and proper jig. I built my finger joint jig from some scrap wood and an 8/32 threaded screw. Takes a few minuted to setup, but works very well.