how the hell am i supposed to figure this out

The 1-7 bridge doesn't work (anymore?), however you can replicate the first half of the bridge on the last half and just add a stone arch plus supports at the end, you'd complete the level with the crown.

Le 7eme pont du chapitre 1 ne marche pas (plus?), cependant, on peut dédoubler sa premiere moitié sur l'autre moitié et simplement rajouter une arche de pierre à la fin avec un support, c'est suffisant pour finir le niveau avec la couronne.

Would be screwed without this guide. Super helpful - thanks!

Thank you very much :)

Chapter 3 / Bridge 10 doesn't work for me. If as me, it's a pain in the a**, you can try this : http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=913803393