I also trimmed the main pipes. They are not symmetrical. the frame rails aren't symmetrical, so these couldn't be. It's OK, they are close. and the main tubes are very close to level. I also capped off the main tubes. I roughed out the ellipses I needed from my old elipse guides I used in college. Those are pre computer tools for drawing ellipses. somewhat obsolete- especially in the work place, but still handy in the garage.
I was able to use my new Eastwood tubing notcher and it worked quite well. Of course, it makes a big mess as I'm using a lot of oil to keep the blade cool.
It took a lot of grinding, test fitting, grinding more, etc. to get them to fit. I first welded them with that "worm bead" and it looked more like gummy worms, so I went over them with spot welding for a cleaner look. I also made some gussets for added strength. Now all I need to do is make the plates that connect to the tube I'll use to trap the engine mount bolts.
What's funny is the pvc tubing I used still fit. I guess I made them accurate, or consistent, to my mock ups...
I also need to make a little more trimming for the engine before it goes back in.