I need to make this out of 2x4 lumber.
It's not load-bearing but needs to be somewhat stiff against skew (L-to-R in the image above). The part I'm not sure about is the end-grain to edge butt joints like this:
Given the difficulty I've had in locating examples on the web I assume this joint isn't common. Most everything I found was end-to-face (sill to stud) and furniture woodworking joints (mortise & tenon, dowel, pocket screws) which are kind of overkill for a simple frame.
What is the accepted way of accomplishing this, and is there a bracket or connector I can use to increase strength? A connector would need to have an "H" shape and I've not found anything like that online. Or, is it as simple as using 6" screws to go through the width of the base board?