I'm a contractor based in Maryland and DC, so the renovation aspect is well within my expertise, having done numerous projects for other developers and general contractors.However, I'm facing a challenge when it comes to choosing the interior design elements, such as bathroom tiles, colors, sizes, fixtures, etc.

Any contract or suggestion they give seems overpriced, whereas contracts/work I've found seems to be much more reasonable. 

She would be putting all the cash down for the property and I'm a contractor and would take care of all of the rehab work along with finding the house, dealing with real estate agent etc. how can we make it so that it would be 50-50 ownership of the property and all future profit? 

Rehab contractor charged $10K, the online report says $16K.

You'll also want to find a good Investor Agent, contractor, and property managers. 

The roof, AC, plumbing, electrical and flooring will eventually need replacements.

Chris kept having reasons for delays, blaming it on the contractor.

The other hurdle is to find a contractor, that is something that you can do as well.

Clarify your strategy—whether it's rentals, flips, or house hacking—and build a team of agents, lenders, and contractors.

You don't see any actual receipts for materials or invoices from contractors they hired.