Wow, now the pressure is on. I went back to the workspace tonight to think about the fender and it's issues. Here is what I learned:

1. I don't think that the issue is with the placement of the support. A few measurements indicate that it should be positioned correctly relative to everything else. I won't know for sure until the fender is mounted.

2.  The problem appears to be interference with the bottom of the fender and the battery holder. Here is my reasoning.  Take a look at the following picture. The original fender is on the left, the new on the right. Note the area on each photo that I highlighted. On the old fender the edge of the fender is aligned with the bracket. On the new fender, the edge of the fender extends beyond (left in this picture) the bracket. This area extended beyond the bracket hits the battery holder and possibly the frame, thus preventing alignment and fender attachment.
 

The good news is that some judicious removal of sheet metal should make things work out. I probably won't get to this stage until the weekend. As a further note, it does appear that the old fender would work fine, so the fitment issue is not due to the tub or tub alignment.

Rommel, if you are interested in my old fender to use as a reference, I would be happy to figure out a way to get it to you.

Steve