Glueing up lumber to make beams

I’m buildiing some brackets to hold up a new porch roof extension. These are copies of brackets used by Stickley on his houses to hold up roof gables. I need 4”x6” stock to make the brackets (basically an ‘L’ with a 45 degree brace). The brackets extend about 40” out from the wall, and have a 60” tail going down the wall.
I’ve been deconstructing the old house structure and now have dozens of good straight 2×4 wood. The boards are great – lots of growth rings per inch and very straight, in spite of being 100 years old. In the spirit of being green, and aslo as an excuse to work with this wonderful wood, I was wondering if I could plane and then glue up this wood to form the larger stock dimensions I want. Everyone says today’s glues are stronger than the wood itself, but I’m wondering just how true that is. I don’t want to have to replace a porch bracket in 12 years.
These would be for outdoor use, and would be painted. Do you think I would be better with solid stock?
I’d enjoy any thoughts on this.
Clif