Demo all the drywall out, remediate mold, complete reshingle of roof, replace all windows, replace all outside soffit/fascia/dormers, replace all siding, repipe whole house, rewire whole house, redo all mechanicals such as hvac, redo all interior and exterior doors, paint interior and exterior, replace any framing or insulation damaged by mold/water leaks, replace all gutters, minor landscaping, minor outside repair of concrete wall, install all new cabinets, install all new countertops, replace everything in 6 kitchens, replace everything in 6 bathrooms, install handrails,  install significant flooring and minor subfloor repairs, and install all trim in house.Project will cost around 150,000$.What would be fair for this?

Use an already completed and engineered design that is close to what you want and can be purchased for a few hundred $.   

You rather loose couple hundred dollars than dealing with headahce.

Put new knobs on the kitchen cabinets, and replaced some broken soffit pieces and window sills that had rotted out.

,Especially with hundreds of thousands of dollars on the line ?

Keep analyzing deals every day and eventually one will come across and after looking at hundreds of crap deals it will be such an obviously good deal you will buy it without a Second thought or worrying about losing money because you'll be like even if I go over budget by 20k I could always sell it make a great profit, rent it, brrr it or do a heloc because I have so much equity here from day 1.

Don't take that risk for you and your borrower over a couple hundred bucks.

This survey contains hundreds of KPIs that investors should use when searching for new markets to invest into.

I have made hundreds of offers sight unseen but I had systems in place and we are also talking over 5 years ago so times were a bit different then.

There are literally hundreds of hard money lenders out there, you should look into that option or find a money partner.