Cisco :: Multiple Routers Nat To One Server?

I have a job with a budget-limited client who has three Cisco RV042 dual-WAN routers. They had hoped to establish rather seamless *inbound* service, which doesn't seem to be the real purpose for these units, they appear to be designed for bandwidth aggregation and/or rather seamless *outbound* service.Since they have three of these routers, and three broadband connections (two different 5 IP blocks at one ISP, one 5 IP block at a second ISP) I am toying with the idea of using one router per broadband, and configuring each router for One-to-One NAT, dispensing with the dual-WAN redundancy feature.Each router will come from a different public subnet, yet have a one-to-one NAT to the *same* internal server, for instance:

Router 1 - 74.92.X.X ---> NAT ---> 192.168.1.100
Router 2 - 67.78.X.X ---> NAT ---> 192.168.1.100
Router 3 - 97.76.X.X ---> NAT ---> 192.168.1.100

The routers will be configured on the same subnet internally. 192.168.1.1, 192.168.1.2, and 192.168.1.3 respectively. I'll use weighted multiple default gateways on the server's IP configuration, to establish their default and failover gateways.My question is, does configuring multiple routers for one-to-one NAT to the *same* server cause any conflict or failure? You know, of the "sorry bub that private interface is already sucked up by router 1 and I can't do this" nature?