Hey there, just discovered something myself. At first i had the same problems like the others.
1."#####" in the buildings list. After quitting the game and restart i had the proper names and the new buildings were available from the start. This always happens when starting a new game. The #####-problem seems to be gone.
2. Today i loaded an older savegame and i didnt have the duplicate entries in the build list. After going on a mission and recovering a scout datacore, the enhanced construction became available. Working as intended so far.
All this was done on the CE branch on steam with all mods from the CE activated + Fire in the hole mod.
