I applied for the family visa via marriage on 11/10, one day before my 90 days as a tourist were up. At the time, I didn't the marriage certificate, ficha or police certificate from my home country ready, so instead I just uploaded receipts, appointments and short explanations of why I didn't yet have anything.
The biometic appointment was very simple. My appointment was at Lima Carabaya and I turned up 1 hour early. Although it was completely full inside and outside I was allowed straight in and my number was called after about 15 or 20 minutes. The actual taking of fingerprints etc was quick and done within 10 minutes and I was out.
Due to the lack of appointments in Lima for the ficha I went to Arequipa. I turned up at 11am and was just the third person they had seen all day. One thing they asked for which isn't mentioned in the article was proof of entry into the country. At least in this office, they'll direct you to a place across the street where they'll print this off for you. Again the whole process was done within 30 minutes and I was handed my ficha there and then.
I uploaded my marriage certificate from Reniec and the ficha on 28/10. Then on 31/10 I for some reason had a notification in the Buzon asking me for a birth certificate to prove a family tie within 5 days. I just requested an additional 30 days and then on 8/11 uploaded the police certificate from my home country. Then yesterday, I video called migraciones and explained about the previous notification and that I thought it had been sent in error. The person from migraciones was extemely helpful and said they'd send an email to the area that deals with it to look into, and amazingly 4 hours later my visa was approved.
The entire process really is quite simple, but only thanks to the clear explanations and advice on this website. Thank you Eva!!