Quote Originally Posted by Greenish View Post
Powerful Build allows you to be counted as one size larger than you are for opposed rolls, when it is advantageous to you.
My life seems strangely backwards. You're confusing Jotunbrud and Powerful Build (which everyone does). But you're making the racial feature weaker, rather than making the feat stronger.

Jotunbrud does what you said.
Powerful build does all that, and lets you use a larger sized weapon.

There's a description of powerful build under halfgiant.