1. Double click on the Master View Representation
2. I have never ever used stretch - attach file demonstrating where this would be the best technique.
3. Attach the file here. (are you familiar with... well never mind, just attach the file here...)
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6. You should be able to place anything in an assembly?
7. Several ways - what version of Inventor are you using?
8-9. Derived Component (also check into shrinkwrap).
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13. Pattern features - not sketch entities.
14. Create cap and place (no automatic tool, how many different sizes do you use? look in to iParts)
15.-16. Of course Project Geometry is useful. You can break the link if desired.
17. Always works here - attach file here that exhibits this behavior.
18-20.
21-23. Rebuild
24. Measure
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