Setting wing spar up for no twist when riveting top skins

Any tips for how to best setup the wing spars for placing and riveting the top skins on? A friend built an RV-9 and talks favorably about having a wing jig, but I don't have that. I did build a wing stand though.

For those who built a wing without a jig, what tips can you give about how to keep it straight and true?..?

Wing jig

I thought the 14 didn't require a wing jig. Personally, I wouldn't build without one. Even with 100% clekos, the wing can twist. A jig keeps everything straight. Check out builder logs. Lots of ways to build one.

I did the wings on my bench with no jig and I am very happy with how they turned out. The level of accuracy in these parts is very good. All the wing skins are final drilled and get dimpled out of the box and everything fit perfectly.