This is the original timber schedule for the 16' x 22'. I need to figure how to re- size for 22' x 16'. Any suggestions?

QT
Ext posts front 7 x 10 12' 2
Ext posts rear 7 x 10 8' 2
Interior posts 7 x 7 8' 2
Top plates 6 x 9 16' 2
Wall plates 7 x 10 16' 1
Tie beams 7 x 12 22' 2
Principal rafters rear 7 x 10 16' 2
Principal rafters front 7 x 10 12' 2
King posts 7 x 10 6' 2
Queen posts 7 x 8 6' 2
Collar ties 7 x 10 8' 2
Purlins 6 x 7 16' 6
Joists 6 x 7 12' 5
Summer beams 9 x 13 16' 1
Braces 3 x 8 4' 10

I will frame the floor with timber, so I also need to figure what I need for first and second floor.

Other questions, any alternatives to oak for braces? How about pegs?