GC is a great mod, but it makes "out of home" construction just too complicated IMO, only second to building with KAS. Have you tried attaching K&K Planetary Central Hub to a radial attachment point on an asteroid? You just need 8 kerbals floating tight to it on EVA... After a few asteroid bases built with KAS I now only use it to attach a radial attachment point and EL disposable pad, and than I can build anything (if I have resources, labour and time) without micro-managing EVAs for every single part. Playing game should be fun, not enraging! And taking every build kit from Kerbin without MKS logistics is worse than enraging - it's boring!
With KSPI & WarpPlugin I can beam power from several singularity reactor cores across the galaxy, and my carrier capital ship have enough resources to build a few colonies with their own industrial chains and travels faster than light. Should it be able to slowly rebuild lost mosquito-fleet?