Ouch -- Tough luck. I know what it feels like. Looks like you found a muddy patch!

I am sure there are many approaches to rebuilding fibreglass fuses. I have a mishap prone Hydeaway that has been in twice -- once through radio issues, the second through a mid air at a comp. I am lucky in that I am flying it with an OS140 so a little extra weight in the nose from the repair isn't a great issue.

My 2c worth is to take your time and do it bit by bit. Photos below may give you some ideas:
- Thin CA is good to help tack bits together and help lock up minor cracks etc.
- Then fuse jig and balsa sticks on the outside to get it all locked up and straight. If you can't borrow a jig they aren't hard to make.
- Then glass cloth and/or other strengthening on the inside to lock it hold it all together.
- Lots of sanding and filling parties -- using either laminating epoxy and micro-balloons, or polyester car filler (I have used both without issue -- but tend to use epoxy for big filling - verging on structural - and polyester for minor holes). Then a filling primer and paint.

Sounds easy -- just takes time. Hope this gives some ideas.

David