I finished my new set-up at my new place. I’ve got a normal height window instead of the ground-level one from before, so I used some plumbing piping, and acrylic & an insulating tube for the window 
Now that I know it’s working I’ll likely replace the gaff tape with something more permanent.
I’m still using my original 4" Vivosun and my blast gate from @DaveStruve’s design.
and of course I cut the last piece of insulation (going around the fan exhaust and through the acrylic) just a touch short hence the tape there
