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Wood truss

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     I have a wood truss design that I would appreciate feedback on.  This 
     truss is to be used for roof support on a barn.  It uses 2x4's (flat 
     side out) for chords and diagonals with OSB "gussets" nailed on both 
     sides.  The trusses have a 20 foot span, 4:12 side slope and spaced at 
     24" on center.  The nails are to be driven and "clinched" (bent over 
     on the far side).  With the double shear on 10d nails I need 6 nails 
     per member on the largest loaded connection.  Some connections are not 
     concentric, so this number would go up.  
     Things I was wondering about:
        1) Will OSB work OK vs. plywood in this application?
        2) What is the recommended nail spacing and edge distance?  
        3) Any other special considerations for gusset size?    
        4) What is the best way to brace the bottom chord for wind uplift?
     Ed Haninger