With the help of Martin from Mosco we found out the day we left was the day the subsidized bus leaves from O'Higgins to Lago Christie. Left around 1130 and got to the TH ~13:00. The bus only goes 4x a month and it went twice in the last week of February, not sure how it is organized. Only 3500 each.
Pretty terrible forecast but luckily it only rained a A little bit the of rain The first dayand a lot of rain at the end. The trail was fun, mellow and in good shape, next to no mud. We met Ruben and all of his animals (cutest puppy atm), he walked with us for a while to show us the route out of his property. He offered a camping spot but I am sure the dogs would be all over you at night. We camped at the beginning of Allegra near Refugio entre lagos (NO refugio), -48.09404, -72.49798__. At this moment there is no shelter but it looks like someone is working on one, there is a boat at the lake. There is a creek with only still puddles so we drank from the lake.
There are few nice camping spots along both Christie and Allegra that are not marked. Did not stop to fish :(. I heard Margarita is in O'Higgins atm.