Thanks Jim.
I just use a coated clamp like this to mount to the frame, and then screw the guard to the flat side.
That bike would have looked 'unfinished' without a nice left chain guard with this on the right.
Anyway, a good pair of tin snips you can put a left side chain guard on bike with full fenders and 2+" wide tire.
Cut the chain guard to fit the tire, and the fender to fit the chain guard.
NOTE about cutting the guard, cut a \_/ to clear the tire, and cut the sharp point off the bending piece and BEND it in to a round edge, this will protect your tire should the two meet.
Cut off any straggling guard out the back, and if you don't have a coated bracket, a couple of zip ties hold it.
Zip ties however will stretch and rattle over time, a coated bracket never rattles ;-}
One more note since it is a good pic for the chain tensioner...
The chain stay on this frame is not straight with the chain.
Most aren't.
All you do is mount the tensioner's lower parts where they need to go, the way they need to go to be pointing straight up, to the chain stay, and then use a crescent wrench to twist the single piece that goes up from there to make the wheel in line with the chain.
Hope that helps ya EZ, good luck on the build ;-}