Answers

Unfortunately it sound like your shower pan was installed incorrectly. Im afraid it will most likely have to be removed to start over again.

I agree with Jared. You will need a high temp sealant.

We agree with everyone that notes to fix your roof first, including any gutters and downspouts. Remember to be sure to run the water AWAY from the home. Water coming down around the drip zone of the foundation is a big problem and can be addressed with those initial steps. Then, you can and should address the foundation with a reputable foundation contractor. Water kills a home. Use the top down rationale and control it. But definitely fix that foundation but after everything above is corrected. Good luck.

In all honesty, hire a professional electrician. They will know how to install the right equipment to be sure your fan remains where it belongs and is safely wired. Good luck!

You can try clear plexi-glass type panels, if your trying to keept their heads from getting stuck between the balusters.

The difficulty depends on many things.

I would say PT post is the way to go, but install it over a post standoff past so water doesnt get trapped between the bottom of the post and whatever it is sitting on causing premature rot.

Good answer by Abe. We prefer to use fixed contracts with our clients. We have clauses in our contracts for unforeseen itesm such as concealed structural damage or inadequacies. I fully agree a professional remodeler, that knows what they are doing, should be offering a fixed contract.

Yes, definitely check out a product from PGT Industries called Eze-Breeze. 

Check it out at http://pgtezebreeze.com/

Search for "barn movers". That may be a good place to start. Also, ask local spa companies for recommendations

I second the suggestion for the Eze Breeze panels. Great product and our clients love them! Here are a few pictures of a nice porch we completed a few years ago using this product.