Why wouldn't you want to see the four-foot model again? It was, if I recall correctly, the model preferred in later seasons as opposed to the six foot ship used in the initial seasons of the show... am I misremembering?
Yeah, they only ever shot new stuff with the 4F model in later years, but I (almost) always hated the proportions of the 4F. (Still looks good from some angles though.)
And of course, the fact that they would cut back and forth between new 4F shots and stock 6F shots only served to highlight the differences.