My 2 cents, sounds like you guys should be doing some colabs.
It makes a little sense to build templates, before a full blown game as well.
Especially since Constructs still beta. Speaking from a newb point of view tuts on each template would be a good idea too. BTW the Ghost Shooter tut was wonderful. Now, one other thing, there's dozens of types of engines, you should probably agree on specif types before making templates.