If your doing it on a spec basis it might be hard?

You have laid out a very premium AR design that will come at a premium cost to build.
It will be worth every penny but may be hard to make a profit on????????
(unless you are building the barrels in house and buying in very very large qtys)

When you set up an AR with all the options it is a higher cost product and many times the average shooter can not pay for all the options at once.  Generally they will buy the basic platform and then add accessories as their budget allows.
Also when the shooter makes up their mind to spend top dollar, they often may want to set it up a bit different than whatever the current configuration they are looking at in front of them.

I only offer this info, because I have sold off some of my extra rifles at times and usually lost good money when I had the high end stuff on it.
Example:  A potential buyer may not want a RAS but wants a DD and therefore is not willing to pay the extra for it. . . .

just my $.02, but I wish you the best of luck

BTW - the specs you laid out would be an excellent set up !!