How to Configure DHCP/NAT in Time Capsule

Assuming I can get my Comcast Cable model to act as a bridge, I see advice for setting up my Time Capsule as a DHCP/NAT.
On the Comcast Cable modem:
WAN IP address  = 174.13.188.121. <- fake IP
WAN IP gateway  = 174.13.188.122.
WAN subnet mask = 174.13.188.122.
LAN IP address  = 10.1.10.1.
LAN subnet mask = 255.255.255.0.
I'd like to use 10.1.10.11 for Time Capsule, 10.1.10.13 for Mac Mini Server, 10.1.10.17 for iMac#1 and 10.1.10.19 for iMac#2.
But nooooooo. The AirPort Utility offers only the following DHCP Ranges:
10.0.1.3 - 10.0.1.200, or
176.16.1.3 - 176.16.1.200, or
192.168.1.3 - 192.168.1.200
There's a checkbox for "Enable NAT Port Mapping Protocol," but the documentation on it is poor. There's also a checkbox for "Enable default host at: 10.0.1.253, or 176.16.1.253 or 192.168.1.253," but its documentation is equally poor. Apparently Apple didn't see the need to explain how these things work.
If I use a LAN IP of 10.0.0.1 for the Comcast Cable Modem, then use AirPort Utility to set a DHCP Range of 10.0.0.3 to 10.0.0.200 I receive a warning message that "The DHCP range you have entered conflicts with the WAN IP address of your base station."
I don't see the conflict -- what is wrong? Better yet, how do use AirPort Utility to set up Time Capsule?

Thank you for your response, but I remain completely overwhelmed by this mess. What should be something simple has become an enormous task.
Internet
^
Cable Modem WAN IP: 174.13.188.121 (fake IP address)
   Subnet Mask WAN: 255.255.255.252
Cable Modem LAN IP: 192.168.0.1
    Subnet Mask LAN: 255.255.255.0
I'd like all requests to my public static IP 174.13.188.121 to be served up from my Mac Mini Server with private static IP 192.168.0.19.
   Time Capsule IP: 192.168.0.11
Mac Mini Server IP: 192.168.0.19 running Server.app
iMac #1 Client IP: 192.168.0.17
iMac #2 Client IP: 192.168.0.13
I want the Server.app to serve the public. The above is what I have configured now. Some behavior is odd. For example, I can access the internet from the iMac clients but not the Mac Mini Server. I don't know why.
In other words, how do I string together my Comcast Cable Modem, Time Capsule, Mac Mini Server, iMac#1 and iMac#2 into a useful LAN that can browse the Internet and provide FTP and Web service?
I would think this is a common setup with several sample setups available on the web. No such luck.

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