Is that accurate?

I have found myself trying to figure out more efficient and more accurate ways to come up with an ARV.

Without the financial goals, this question cannot be accurately answered.

A guy/girl from HD is NOT the person to give you an accurate renovation cost/budget.

Appraisal $2500 seems accurate, you should get an engineer inspection $1000-1500, I personally would but this is optional if the building appears to be in good shape..

Is this accurate?

Is there a method to accurately predict arv accurately without having to leverage your own years of experience?

You'll get the most accurate advice and guidance from someone who walks the walk, not just talks the talk.

Consumer self reported scores are generally accurate on the very high end (790 reported v 820 actual = same interest rate pricing, no difference), and very accurate the very low end (480 reported v 498 actual = no Agency mortgage either way). 

Renovate your current kitchen, take the family to disneyland, gamble it away in vegas, or buy another investment property.