They sell them through other dealers and here also just look up kreg bit
It does not
Not this one but you can buy a kit that does
When I got mine it came with a vice grip style clap
1" is enough. The grey porrion of the jig is adjustable to work with different thickness of wood.
To the extent any screw could do it I suppose yes. However, my experience is that screws don't hold well there.
Seems to be normal and I'm not sure it's meant to be removed.
I'm not sure about the side load rating of the screws but if you are building this platform bed for an adult, the load should be resting on at least one load bearing post. The platform itself can be built using the jig and screws then the platform corners should come to rest on top of support beams (at least one) depending on your design. Especially if, as you stated and I'm quoting " I'm a big guy". Hope this helps.
Yes. It's actually perfect for that.
The only other things you need are a drill and a clamp to keep it from moving.