3) If we buy properties for rentals, we buy them using the LLC, but if we want to remodel them then we remodel them through a construction company in the S-Corp, is that correct?

I've always done construction from plumbing, carpentry, paint, and even building houses.

After the fire, our insurance company sent out an adjuster for the construction portion and another adjuster for the contents/textiles portion of the claim. 

I think you need to analyze what your skills\assets are and pick the model that best fits those.As an example, if you are in the construction industry and can do most anything then flipping might be the way to go.

Hello BP rental investors, I have an LLC with a Residential Building Construction Class A license. 

You should have  note, mortgage, appraisal or CMA, scope of work, personal guarantee, escrow agreement if they are taking construction draws, lenders title insurance,  and be listed as the lender on their property insurance policy.

Always overestimate your construction budget and underestimate your ARV and make sure the deal still works when you do that.

Mid 80's construction vs mid 60's. 

New construction, single-family home What made you interested in investing in this type of deal?

So in a housing market like DFW where new constructions are in incline, does it make sense to invest in older houses.