HAH! I did exactly this with my daughters when they were like 8 or 9. Except I just printed out maps on a piece of paper and we used everyday items for the spaceship. I had a golfclub I used to steer the ship, we had walkie talkies that were scanners too when we explored planets, and I think one of them used a collander as a radar. We cozied up in one of their twin beds with the blankets surrounding us. I basically DM'd the entire thing and they loved it. Weekend mornings while their mom slept in, they'd say "Daddy, can we play space ship?" and then they'd go around the house grabbing things to use as controls for it. Such great memories!

Edit: forgot to mention, I would have loved to have Thorium when we were playing. But then again, I loved their imagination.