Ok, I put it back together and used the tractor today, I fixed it under a day, not bad for a first timer job IMO.
I didn't do the pressure test but, i blew compressed air before even doing to the repair. So probably the weak holes blew up.
I didn't take any photos yet, but I will eventually because I need fix the protecting front.
Also no leaking in sight, I never been so happy about a dry radiator.

Thanks you guys for the tips.