Wanting to make werewolf Kaiju Heros, would like some help

Hey hey yall, haven't played in a while and im wanting to get back into it by trying a build again. The general idea is a hero run that culminates into the biggest possible wolf form heros absolutely shredding armies.

The main issue with my previous attempts is I suck at heros and im not sure which modifiers stack regarding size and which dont.

If anyone can give me a concrete guide on how to make the best possible melee heros id really appreciate it. Same for if any of yall know exactly which size modifiers stack!