I've looked pretty hard into DIY trips to Strobel (Jurassic) and the Barancoso. From what I've been able to find it is doesn't really seem to be a practical possibility. Access is via private land and many hours of 4wd HC travel. No real infrastructure minus the two lodges, not that you need it to camp, but it is pretty lonely country. Very, very remote. It would be a pretty involved expedition bringing all of your gear, food, and fuel with you from either the US or big city down there then making your way to the lake, that's if you could secure access and transportation.

I fished the Gallegos which doesn't have nearly the populations of searun brown that the Grande and the rivers farther south in Tierra del Fuego.