We spent a majority of the day testing position in the wind tunnel. 5+ hours of wind tunnel time is significant, contact a wind tunnel and ask about their hourly rate.
Our time in the wind tunnel taught us a ton about position changes and equipment changes on aero drag. Some of what we tested had no surprises but then we would discover something new. Narrower and lower isn't always faster!
I hopped in and helped out as long as it didn't involve me using the left side of my body that a damaged a few hours earlier.
Everybody picked a change they wanted to make and then the aerodynamicist validated it. Some changes to position show significant improvement and other changes showed minimal improvement. Don't always believe what you read on those slowtwitch.com forums.
The fans that pull air through the tunnel are massive.
The tunnel also has internet so we watched a few You Tube videos on the ground display while the fit bike was being set up.
It was cool to be the first fit class ever to learn in the new wind tunnel.