Thank you Rhonin_the_wizard. 

Loaded up the saved game. Not built on home/capital world. Playing as a SILICON based custom (no slaver/exterminator abilities) race. No documentation on the caveats you mentioned. Can rebuild on planet (class 18 w terraformed tiles) where first built. Feels like something wonky in the xml (above/beyond my pay grade/expertise) ????

Thank you Rhonin. 

Never having used this file sharing mechanic before I hope that I have followed the procedures correctly and that you can access the file. Despite the file name referencing CRUSADE I am running the Retribution DLC.

https://drive.google.com/file/d/0BxwyGcnYO6Vkc3RhcnRlcl9maWxl/view?usp=sharing&resourcekey=0-qWQry1MCuUqeObbqelauDw

Planet in question is Dendra III, a class 15. 

I have spent several hours searching for the location of galciv's save game files, both in my local windows 10 filesystem and for documentation on the net. The search has proven fruitless. 

..\Documents\My Games\GC3Crusade\Saves was the location/origin of the file whose link I posted to Google.

Perhaps these are the save files as produced by the OPT IN BETA galciv3 that I am running ???

As further data I note that the timestamps on these files change to the current time whenever I save my game using the same filename e.g. HS9-3.1 ( Hex Sigma 9 (race name) - Game 3 Move 1)

I am running not only the Crusades DLC but the Retribution DLC as well. 

..\Documents\My Games\GalCiv3\Saves contains only a single file "steam_autocloud.vdf"

I sincerely and abjectly apologise for wasting your valuable time, I could have sworn that I checked the link before and after posting it. My Bad. 

https://drive.google.com/file/d/1Ig0r5y5tvDFo5plBboA5y3J1qTc-EYjK/view?usp=sharing

Have reposted and double checked that I have posted the, hopefully, correct file. 

Another procedure I was unaware of. Fixed it I hope.