I see that your model supports a max. door weight of 300 lbs. A 4/0 X 6/8 SC door should be under that, so it looks like a good choice. I assume from your description that neither of the walls is a bearing wall.
One other suggestion depending on the "look" you are going for in the remodel is to use a surface mounted sliding door. This gives a bit of a 'barn' or 'industrial' look. The advantage is ease of installation and ease of periodic maintenance of the rollers. But your pocket system looks like a good one, so I would not be uncomfortable with that, either.