Remove all the skin and replace it with fiber glass to make it lighter.

Get some skin in the game and actually work the process for a few years before you form your holier-than-thou opinions. 

While Examiners may be able to evaluate the adequacy of some cost segregation studies, other studies may require specialists with expertise, industry or construction experience and specialized training"..."  

Now, you and Bob negotiate if he will lend you all the money, or if he wants you to have some skin in the game.

And even then I might still retain them, the same way I do for evictions since I theoretically COULD do it myself but find it worthwhile to hire the specialist and recommit my time to other income-generating activities.

Use gloves or a mop, it's hard on your skin.  

But only if you do it at the right time and at the right location.Thing is, you have to do double triple DD and pay a professional/specialist that's more knowledgeable than you.

Since you are also looking at both commercial and residential properties, It would be worth reaching out to some commercial brokers, Multi family specialists, and probably want to look for someone that is in the 5-50 unit space.

In short lenders don't like when you have no skin in the game at all.

A LOT of different ways to skin the cat here!