I built my Seeley Commando 850 in 1978. I did it just because it was a good thing to build, and it was similar to a Gus Kuhn Commando. But I never believed in it because of what was inside the motor. I thought it would be completely hopeless without extreme modification. I finally got around to racing it in about 2003. I have never used any other motor which was so responsive to minor tuning. If you use the heavy crank in a certain way, it is excellent. When I was young, I had many hotted-up Triumphs. The Commando motor is far superior. I think a lot has to do with the rod length to stroke ratio. And the combustion chambers and ports are better.
If I had been serious about racing when I built the bike, I would have extensively modified the motor and probably stuffed it.
I would not use titanium parts inside an engine. If titanium cops a beating, it changes dimension very quickly. With a Commando engine, you do not need lightened valve gear.