@bsee Thanks, one issue is if it tries building its late-game template near the map edge - I'll have it fixed in the next release.
The other issue is I'm guessing a FA game engine bug where a unit can be given an order to move and build, yet doesn't move - a human player would just give a slightly different order, whereas the AI tries the same order again and again. I've added a workaround for the scenario in that replay, which hopefully will resolve most instances (as I already had a workaround present for the main engineer logic, but my 'shield template' logic is a special case).
Re Czars there are lots of reasons why it might not build them. Generally, I'd expect it to try and build them if it has air control, hasn't moved into the 'build T3 arti/game ender' stage (which is more likely at the high mass income levels in your game), hasn't built lots of experimentals already, and has space to build them. It is intentionally less likely to build them than Seraphim is to build Ahwassas though (mainly because Ahwassas are far better than Czars, even moreso for an AI)