ANAC
Very good info about how to do the validation works in Brazil. I just did that not too long ago and everything seems right... the only huge problem is ANAC (I am still waiting on them) like you said you need to be on top of them everyday... they are really slow and sometimes have mix/wrong information. The place to get the medical is called CEMAL in Rio and be ready to spend 2 days in there if it is an initial medical....