You have to have thick skin and be ready to hear "NO" a lot! 

I note that you didn't indicate the thickness of the product.

From there we led the water out of the crawler, then we put a nice thick vapor barrier throughout the entire crawler and sealed it.

you can waste all the time you want to create a plan and hope to use it one day. or you can go and buy a property to flip or rent. on the bright side,  if the plan is thick enough it can be used as a door stop. 

This is not for the faint of heart and you learn to become thick skinned and assertive, proactive and a hard lined manager/owner.There can be many things that can go wrong and things can easily get out of your control.But if you take a professional approach to things , plan and prepare, become knowledgeable and competent you can turn this toward your benefit and joy.

The filter I have is a 4" thick and it runs $30. 

About 1 foot by 3 feet by 7 inches thick. 

You need thick skin my friend.

Pour 20 sq ft of reinforced concrete 6” thick with rebar. 3.

I should probably try because for upstairs units, I still like carpet with a thick pad (have done one upstairs with acoustic underlayment under laminate and add thick area rugs at turnover, but still careful who I put there for noise)...