I know the route, especially everything south of Abuja, like the back of my hand. The thunderstorms tops can attain altitudes of 50,000ft. It has been raining fairly heavily almost every day for the last two weeks here in Libreville. Therefore choice of season is a critical factor. I would have thought N.H. summertime would be a better bet because that time of year from the equator southwards there are very few thunderstorms. He doesn’t mention what time of year the other guys did it. Personally I would not penetrate any thunderstorm with a small plane like that, you will find many fatal accidents in the register from inflight breakups, spatial disorientation etc. He’s a brave man to say the least.