Thanks to all for the replies and the welcomes, this seems to be a very friendly community, amongst the best I know (along with Combat Mission and SFC, my Favorites !

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I just started the demo tutorial, game sounds great and deep as space !
I also browsed the Web and found an amazing wealth of sites and mods, especially the PBW site ... However spaceempires.org seems empty ..

the webmaster claims all has been lost on April 1st, I thought it was an April's fool but it seems real

!!
As for my first post I realized I confused SE3 with Stars! when I spoke of an overly complex and awkward game, apologies ...
And for the sig PDF, I have nothing to do with Adobe but this happens to be my real name initials and I find them cool - as in Planetary Defense Force also

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I'm trying to have some basic understanding of the how the mods work, but won't have enough time to try them all, so I still need advice about what are the best/more interesting one.
As long as I only have the demo (the real game still has to cross the Pond w/o any wormhole), I suppose I can't install the mods ? perhaps the images and sound files though ?
And thanks again !