My original challenge was my original game-plan, which was to sequence through buying every ship, A-rating and engineering them as I go. I store each ship and start the new one from scratch, without transferring (non-powerplay) modules between ships.
I started this all when I began playing the game when it was first released (Kickstarter backer). I have every ship now except the Chieftain, which is my next and last ship to get. I've not been in a rush and spend plenty of time with each ship as I go, which is why it has taken me so long.
Its been an absolutely awesome trip!
When I've finished it all, I'll go back and mess around with the smaller ships again. It's going to be a blast.