Did this come with a gift case and instructions?
Yes,the parcel came with the case and a manual.
Whats ths max capacity of the loading? Does it really holds weight above 200 lbs?
The max capacity is 350lbs. There is no problem with holding 200 lbs weight plates.
Can I input 2 pulleys together to have them anchored at the top and bottom to use for cable lift up and such exercises?
Definitely, it came with two pulleys. It is perfectly designed for various DIY connection ways. You can use the pulley system for shoulder, bicep, triceps, chest workout, etc.
Can the cable length be adjusted? I want to attach it to the pull-up bar on my rig.
The cable length is adjustable. It came with 2 extension chains, it seems long enough. And the seller provides the adjustment tools to shorten the length as your need.
Can the loading pin suit for olympic weights?
Yes, the load pin suit both Olympic weights and standard weights.