Thanks :)
I think that I don't understand that part about walking "into their local "mirror" copy". On the other hand, I have in plans seeing places you are going to visit and those you've already been to. The windows, vistas in open space sections are going to be used for that. At the moment there is just that enormous tower in the distance that is the only point of reference (and the destination of your adventure).
BTW I loved Nodes of Yesod (zx), from a bit similar titles, I also liked Underwurlde. I can't imagine myself playing them now. Although I do still enjoy Tau Ceti, probably my favourite from the era.