Hornge, thanks for the kind words. Did we speak on the telephone? I remember talking with someone on this subject.
As to the pay requests; if your construction lender has their **** together (chances are they don't) then they will perform a good "fund control" of the project.
Some institutions are looser than others.
Should you end up issuing the checks yourself, I urge you to "joint check"; that is, have two or more payees on the checks. If your GC gives you a bill from "Acme Plumbing", make the check payable to both the GC and Acme. Also, you should joint check material suppliers as well. For example, if ABC concrete brings the mud to the jobsite, and Jones Concrete pours the foundation, be sure and put ABC on the check for Jones.
Fortunately for those of us out here, CA has a pretty good set of laws dealing with those things. I'm not too sure about Texas; it's been a while since I did a deal there.
In CA, anyone furnishing material or labor to a project is required to send a "Preliminary Notice" to the owner, as well as the lender. This puts the owner on notice that the party wants to be paid, and has the ability to lien the project if they are not.
I'll reread the thread and see if I have anything to add. Feel free to PM me with any specific questions, or post them here.
One more thing: Spec EVERYTHING to assure that you are getting apples-to-apples bids from your builder. Obvious example; what kind of kitchen faucet are you getting? Do your plans call it out? If not, are you getting the $29 home depot model, or the $300 deluxe pull-out model? One way to get around that is to use "allowances" in a line-item budget. I have found that using the home depot retail price is probably the best way to do that. If your builder gives you a $100 allowance for a faucet, you go to home depot and pick one out for that amount. For less, you are credited the difference, or, you pay the difference for a nicer one.
Be careful that your builder is giving you reasonable allowances. Overruns are your worst enemy.
Also, when figuring your budget, think about the things that are easy to change/upgrade later. Faucets are, sinks aren't. Shower valves aren't. Carpet is. Cabinets aren't. Spend the dough on the stuff that counts.