Having had 7 of these built in my garage, there are ways to actually take an Integral from box on Friday afternoon and test fly it on Sunday evening. Mostly, it's installing servos, mounting landing gear/tail wheel, epoxying in horns, firewall and rudder/battery trays in Friday night and then the chin and canopy mounting, servo pushrods/pull-pull Saturday and final rigging on Sunday. Just try to group glue sessions together.

We've done this with all motor set-ups too. YS-160, OS-200, Hacker C-50, Pletty 30-10 and Fury F3A. During the winter the test flight was at dusk, but spring/summer time we had enough time for 3 flights.