Questions on the 2017 IDPA rules, reading from the 2017 rulebook.

In section 6.6 Miscellaneous Stage Design Rules.

6.6.10 Blind stages and movable non-threat targets are not allowed.
Does this mean no more moving no shoots? Example, a swinger no-shoot moving back and forth in front of a threat target.
Or does this mean that non-threat targets can not be moved to different locations between shooters?

6.6.17 Painted hard cover is not allowed to cover the path of a moving target. If hard cover is required for the path of a
moving target, it must be made of a material that will not allow a bullet to pass through the hard cover and
impact the moving target.
What does this mean? Can someone provide an example?

6.6.18 No “strong-hand only” strings of fire may require the shooter to engage targets more than 10 yards distant.
6.6.19 No “weak-hand only” strings of fire may require the shooter to engage targets more than 7 yards distant.
I definitely designed a stage like this last year, and unfortunately I didn't get to shoot it and now I never will. Bummer.

8.2 Firearms Divisions

8.2.1 Stock Service Pistol Division (SSP)
8.2.1.1 Start Condition
C. If the hammer must be lowered by pulling the trigger and manually lowering the hammer, the hammer will be
lowered to the lowest position possible.
Using my CZ 75B as an example, since one must pull the trigger to de-cock the hammer, is this rule saying that the hammer will be lowered to the lowest possible position by pulling the trigger (all the way), OR is it saying that the hammer will be lowered to the lowest possible position without pulling the trigger (not lowered at all)?
I've always understood it that if I wanted to shoot in SSP with my CZ I would have to manual lower the hammer. If I wanted to shoot cocked and locked, I'd have to compete in ESP.

8.2.1 Stock Service Pistol Division (SSP)

8.2.1.2 SSP Permitted Modifications (Inclusive List)

G. Internal action work may be used to enhance trigger pull as long as safety is maintained (no visible external
modifications allowed).
I've got an APEX trigger in my M&P. Since the trigger has been changed, I read this to understand that qualifies as an external visible difference that would prevent me from shooting in SSP. I'd have to move to ESP. Is that correct?