My supplier calls it a stress crack and replace the entire sash for me at no cost.  

I always pickup trim at my local building supplier.  

Find a door/window supplier if this is what you need.

Answers:1 - They can be either Cash Partners, where they put in the cash either after the deal is done by buying into an existing deal, or at the start where they are the suppliers of the cash needed to buy/rehab/etc.......or, the Credit Partner, where they would be the partner that guarantees the loan.......or, both.2 - Any of the options you listed can, and have been used by many others to make deals work.  

No issues.If the seller's property isn't free and clear, use a Sub-To and obtain title.You can have issues having a lease-option with repairs or rehab required as you'd need the owner's consent and willingness to work with you, a lease doesn't give you owner's rights to encumber a property by contractors or material suppliers, at least cleanly nor might you be able to obtain permits and insurance coverage may be more difficult.....so get title.Stay out of jail and don't get creative in financing without expert, (non-guru) advise.

I do know that every time we cut taxes or put money back in the hands of the consumer rather than with the goverment, we see consumer spending increase and hiring goes up thus stimulating the overall economy.Now if we can just get more suppliers of fuel and gas since they all merged and are now setting prices!

In this case, it becomes its own supplier.

You will need to qualify with the suppliers that deliver goods and services to the business.

Never purchased from them as I got better prices from either a full service supplier, Lowes or Home Depot. 

Wayne Brooks---I think he mostly bought them from Home Depot, he has been only buying rough material so far. only thing I can think of is the roofing material which he stalled about 2 months ago, I believe the supplier can't lien the property after 30 days from delivery of material to the job site.