If you believe that things are as they always will be, (first you should look at the past and see if that is a reasonable assessment of what the future brings) then taking into account: limitations on what you can invest in, your Solo 401(k) "projected" growth, fees & hidden fees, you can't co-mingle funds, you have to carefully manage the process, future tax increases, tax law changes, a national debt that is north of $22 Trillion dollars, unfunded liabilities and and of course inflation, along with possible "bail ins" then you are well equipped to decide if that is a good choice for your style of investing.However, If you are an "opportunistic investor" . . . . you jump at the opportunity when it arises, then you run into some conflicts.

As many of you know, I've been in this business for many years, developing many types of projects over the years with my husband.

For DTI projections on purchases they will usually use either 75% of appraised rent off the appraisal, or current rent documented on a lease, whichever is LESS.

Take every opportunity you can get to visit another investors project ans pick his or her brain about the repair numbers.

Depending on where your project falls in the above spectrum, we use different companies. 

While there are a lot of factors, there are a couple sites that give you at least an estimate to make some projections.

She's saved up a good chunk for retirement + pension and wants to use it against her rehab project, but I don't think it's a good idea and I can't talk her out of it (neither can her sons).Any advice?

@Andrew Doyle my first project/deal was in High Point, NC ten years ago so I can understand where you are coming from in the NC area.

They already have relationships with trusted contractors, leasing agents, and some have property management in-house.BRRRR can be a good choice, but it all depends on how much time you have to dedicate to the project, and how far away you are located.

We projected that would be worth about $118,000 in 2 years and $125,000 in 3 years.Our rental market research revealed that we would only be able to rent the place out for about $650/mo.