To begin I drew the fitting on some poster board to use as a quick reference and to draw the general outline of the fitting onto the steel for general trimming.
I cut the templates to fit the longerons and the uprights.
Then I traced each template onto the separate pieces of steel for each fitting. These are mainly guildlines for trimming the piece to a smaller size for fitting later.

 

Next I drilled a 7/8" hole (for the longeron) in the proper location. I didn't centerpunch the positions for the other two holes as they may move as I fit the piece to the longerons (a lesson learned on the first one of these I made).

 

Next I cut each fitting to the general shape of the fitting. I then filed the fittings to fit the uprights.
Next I marked the fitting with a vertical line (kind of hard to see in this picture) aligned with the centerline of the longeron.
After marking the centerline I made all of the measurements to locate the mounting holes for the landing gear attach bolt and lower wing attach bolt. Then I completed drawing the dimensions onto the fitting.

 

My next step was to bend the reinforcement tab so it aligns with the crossmember horizontal centerline and trim it to the correct length so the fitting will be the proper distance from the crossmember vertical centerline after it is welded to it. This tab isn't called for in the plans but I didn't want to leave that end just hanging in the air. (Did I confuse you with all of those centerlines?) 
After bending and trimming the reinforcement tab I ground and filed the fitting to the final shape.
After the fitting was shaped I drilled the hole for the landing gear attach bolt. The hole for the lower wing forward attach bolt is not drilled until the wing is completed and ready for rigging.


Not all parts come out right the first time! I ended up
making 11 of these before I got 4 I was happy with.