All AeroScale group builds / campaigns have moved over to the new forum. Remember that if you want to sort them you can use the tag system (provided people remember to tag things properly).
So this link for example shows basically the same topics that use to be housed here.
The only exceptions being a few general modeling campaigns I found housed here, that should have been in the General Discussions campaigns forum over the past several months.
Want to propose a new group build? Make sure to check out the new guidelines and then post that in this area: