Similar seems to apply for many Drengin techs. I have been unable to upgrade my fighting pits to arena and slaughtorium, neither can I see a way to build tourist haven or tourist destination from galactic cruise lines and wonders of the galaxy techs.  I also cannot build an omega research center from slave coordination. I've also noticed a slight discrepancy between the slave recycler, which states "+25% Population Cap" and its upgrade, the protein resequencer, which states "+50% Food." This caused me to think it was a different building rather than an upgrade. In general, I think there is a little much confusion as to what buildings are upgrades vs new, and what buildings are 1 per colony and 1 per civ, which I would like to get cleared up if possible.