got a build log of the bot on here actually if your interested (Dolos mk3 build diary - #8 by morgan_ls) but TLDR you dont have to put too much weight into a hammer saw to get it effective, the whole weapon system probably weighs like 400 grams which is less than some verts, this is because most people have thinner armour on the top anyway and even if they armour up there’s still exposed parts like a link or belts to hit. but they are tricky to drive and when it goes wrong my bot tends to take a battering 