Heck, it's been awhile since last posting...busy with life and of course more planning for the container: measure twice, cut once.
We scored on some oak cabinets that were demo-ed out of a house. Clean condition, match our plan dimensions and best of all, FREE.
We built the first frame for the patio slider that will go on the side of the cabin. It is made from .120 wall, 2x2 steel tube, miter cut at the corners and TIG welded. The frame will be used as a template for saw cutting the opening in the side which will be done with a reciprocating saw. One of the containers' internal tie down spots will be ground off in the process. To prevent binding of the balde while cutting we have fabricated a trapezoidal support that is held in place by increasing the tension on the base with a heavy duty ratchet strap. I prefer this method of bracing over nailing blocks to the floor and hammering in posts because it is adjustable while work is being performed and will not mar the floor.

Placement of this slider is critical as it defines the efficiency of floor space and the level of complexity of the interior stud walls to come.