Building A Pergola When Building A Pergola?

When building a Pergola? - building a pergola

I am building a pergola, which measures 10 meters x 12 meters. I think the use of 3 to store up to 4 2x10 14ft beam and then fell to 16 2x6 beams. If the 3 seats to be sufficient to reduce the support of the beams and rafters, without?