a good way to get metal is to breed a pack of argentavis and make them follow you when you go to farm metal because they have a metal weight reduction so you can carry more and don't forget to get a ankylosaurus for more metal

A good way I found to get chitin is farming the scorpions with a axe you get like 120 -140 each

Works as a smithy but you can’t repair things in it

Although it technically can make Behemoth Metal Gate frame, your Argy is unlikely to be able to hold ingredients in its inventory.

Kill trillobits and you will get a lot of chitin

Kill bugs to get the most chitin

Try fishing if you are not high enough level to get this

don’t bring your bird in to a sticky situation

Tame a saber and cave or look for bugs they get around 40 chitin per kill

If you want to get the saddle fast go for the chitin and kill the scorpions they give 30 to 50 ot 60 chitin idk just go for the chitin