For instance if I’m looking at potential capital expenditures over the next 5 years and the range of the cost is between $25k and $75k, I would use $75k in my projections.

Focus on tax-saving strategies such as cost segregation studies and bonus depreciation to accelerate deductions.By qualifying as a Real Estate Professional (spending 750+ hours annually and materially participating), you can offset your wife’s S-Corp income with real estate losses, reducing your tax liability.

What is your price range and what do you consider to be a "medium" rehab project, rehab costs = to 25%-50% of the purchase price?

Total cost of land and size?

It was just an offer (costs extra) through a local lender I used!

Vendors who partner with Costco pay for market exposure and referrals, which often adds to the final cost passed on to the customer.

I completely agree with @Ashish Acharya's points about the cost-effectiveness of a HELOC and the potential credit implications if it’s secured by your primary residence.

Looking for success stories or other experiences , positive or negative, range of costs, etc.

You have to have exit values of single family homes high enough where build cost can work.

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