How to get heavy armor parts?

[Wild colonial boy]

I'm near the end of Gallic campaign and I need 3 more heavy armor parts. Where I can find them?

[asarokk]

All material can be gained by dismantling certain equipment but you only receive portion of the materials needed to craft the equipment.

You receive material from the last phase of legion battles, it's randomized loot.

But mainly you gain material from treasure chests. If you visit the observatories on the map it will generate more treasures, schematics and equipment.