Here's the front spar after being riveted together:
Here are the HS-405 ribs riveted to the front spar. I couldn't get all the rivets with the squeezer so I had to shoot/buck some. They turned out pretty good.
And now, here's the HS-404 ribs riveted in place as well – these rivets went in with the gun too:
The left side has an extra rivet, as seen here. I hope I don't have to use aileron trim to counteract the weight imbalance. (joke)