Mike F said:First of all well done for having a Devon Moonraker - the best conversion to my mind! It's about time we had a Moonraker subgroup as well...
If you ever get to see rjb63's excellent van take a look at his box & back which makes a seat in the walkthrough. I've made a rough copy just for show but it's not the real thing, something to look for at shows I guess.
As for the single seat mine locks on its own on the tracks, a lever by the side does it I think.