Can't tell you if your repair and capex budgets are accurate.

Gather up all your legal concerns and bring them to an attorney / insurance agent.Ask them at what cost it would take for you to sleep well at night - go with the approach that is simpler and more cost effective.

They should be able to provide you with some accurate data for the specific house in which you’re interested.  

Hello, I am trying to learn how to compare comps in a very accurate way.

Engineering companies will often assist with gathering bids and assessing costs.

Most capex expenses are going to be a similar price in both of those houses, so using 10% of rent might be a little bit less accurate. 

Without self promoting, you can then skip trace at a company that provides credit bureau level data -- since this will give you the most accurate numbers.

But your contractor should be able to accurately estimate the costs of the building materials for the job.

It has come in really accurate compared to the actual bill and pushes a heavier share to larger households.

If your repairs are calculated based on a % of revenue, that does not exactly make for accurate underwriting.