Stock racks...what do you use?

[Mayhem]

That is how I did it Ed but there are two ways you can do it, which I will show below.

The way you have drawn (the way I did it) allows you to form both the outside corners of the frame as well as the inside joins.  A simpler approach can be used if you are only making a 90° corner.  This method is show in the image I linked to earlier.

   

Using the method I did, you need to cut out the corner of the angle, as well as one of the sides. Further, you need to radius the end of the remaining piece so that it would sit nicely inside the angle it was being joined to.  The image shows this better than I can describe it.

In the "simpler" option, you cut the notch wider by 1x the gauge and then you don't have to make any more cuts or radius the end.  You do have to remember to take the 2x the gauge off of the section it is joining to (blue hatched piece) when cutting your lengths and leave the notched piece the full length when using this method.

Given that the second method only works for when you are making a 90° corner, I went with the first method for all the notch joins, as I only had to calculate the length once and cut them all the same.

I guess it is your call on which approach you take