The nicks in the fan are common with the byron fan cause it sucks all kinds of crap through it, but you can, and should buy a new rotor. The housing does not really matter the nicks won't hurt it. The cracks on the fuse look just like any other high time TG F-15. Fix'em glass'em and fly it. The red stuff is putty, use some Evercoat polyester glazing putty after sanding, and cleaning, and you can fill all those cracks and make it look pretty again if you so desire. The TG F-15 is the "Ugly Stick" of jets, fly it crash it fix it fly it again. We used to bounce them off the runway doing low passes and all kinds of abuse, fun to fly. I wore out 3 or 4 OS .91's and 3 sets of retracts in mine. It still hangs in the ceiling in my shop and looks worse than the pictures you have there.....but if I really took the notion it could fly this weekend.

Have fun with it.

DR