I'm too gathering parts for a homemade riser. I'm using a generic factory water injection elbow, and the rest (I think), will be black iron fittings.
Having to make this conversion, I'm faced with new problems including potential engine flooding. I'll post my work as I go. I hope you do the same. It's very helpful to see other peoples set ups.
Your design is pretty well set or will you change it? Any problems other than wear with yours? How about the length and weight of your riser, any problems with engine mounting?