These tiles are a welcome addition to the eFuture line, though I've yet to find quite as many possible configurations as in the starship package. The basic transport (as shown in the product preview) makes a 23" x 33" transport with an 8x12 cargo bay.
It is easy to remove a row for a smaller transport, and with a little creative use of an alternate corner tile, even add a column down the center for a really large transport.
The only thing that kept me from awarding the highest rating was my desire to build a transport with some measure of defensive weaponry. You could just declare that one of the command chairs is the weapon station, but I prefer something a bit more clear.
Otherwise, you're all set for a star trader or a fleet transport.
Well worth the price!