I only have one side open. could I build a half truss?

Hi, I need some advice on repairing rotted trusses. I;m pretty handy but far from a professional. I have a 1987 14 x 70 that has been leaking on both sides of a fake dormer roof. I have completely removed the wall and ceiling panels of about a 16 foot section. There are 5 trusses that have rotted wh...