Hmmm.. I know you could do it with 192.168.0.0/24 and 192.168.1.0/24 - 
but I don't know about 10.0.0.0. However, big question - why bother with 
a second NAT? Can you just assign whatever would be using the NAT to use 
a seperate subnet?

As such: I have a coporate HQ using 192.168.0.0/24, with a frame relay 
router on 192.168.0.250. Each branch is connected to the router, with 
subnets 192.168.X.0/24 (X=branch number), and each branch's router is 
addressed 192.168.X.1. Each branch router serves it's own DHCP for it's 
branch, and routing is simple. Of course, the limitation is that we can 
only have 253 devices at each branch, but there is no translation going 
on, so all devices are directly addressable internally. Also, we have a 
dial-up system in the corporate router, that assigns addresses in the 
block 192.168.255.X. I can dial in from my home network, which dials in 
as 192.168.255.1, and uses NAT/DHCP to assign my home network of 
192.168.100.X/24 (which does NOT exist as a branch), and everything 
works great (except that I can't directly address my home machines from 
work, as they're behind NAT).

Any questions?