The drawings are for demonstrating the concepts only, Yes it will have to acomodate at least 4 people. It's very interesting to me having traveled around the Philippines just a small amount, that each region has its own concept of what a trike should be, and as well how many people it should carry. The latter seems directly proportional to the remoteness and size of the munincipality. Trikes in Cavite can carry two or three, one of me at 6'2", very small nimble and geared for geting as many fares in succession, since it is in Metro Manila, rides are short and passengers numerous. The opposite is the Siaton Trike basically similar to the dumgte model but with a mini easy ride cabin stuck on the back instead of the luggage rack. I am fairly adventurous, but I became fearful riding down a big hill on one of these with no less than 19 people on board. some on the roof. So there does need o be compromise, my idea is to give an urban trike the ability to travel faster, more nimbly, more safely. To carry 4-5 folk, and some luggage. We may have to forgo the house load of bamboo furniture, the two pigs and a goat, and the 5 sheets of plywood. There are in fact cargo trikes better suited to those tasks anyway.