Alliance Tech Tree and alliance helps!

Hi, personally I think a good feature would be an alliance tech tree for more clan cooperation and teamwork as well as an alliance help system to reduce building time/research time.

Another possibility would be having an alliance base where you could donate resources to a grand storage for the alliance which is then used to build/upgrade special alliance buildings with set purposes maybe as an example a alliance farm would boost food production for the clan by 5% per level, an alliance war hall increasing max rally troops or slots per rally allowed, etc...