because that's what happens when you make the game to stick with Turm 1. Everything seems to work so far, but if you ever get to the point where Radar is used, it's greyed out, and the F9 key has no function
Turm 2 and Turm 3 work with radar, and could be configured for the whole war as well. But they seem to give you radar warning receivers early on:
At least I got "empfange Radarsignale" messages from as early as 1942.
So yeah, I see several half-solutions that can all prevent the Umbau desaster from happening, but not one that does everything. Possible solution would be to offer three optional hotfixes, "permanent turm 1", "permanent turm 2" or "permanent turm 3", all with their own drawbacks and advantages. If someone has a better idea, I'd be happy to discuss it.