Cisco VPN :: ASA 5505 - Twice NAT Across Site To Site Tunnel With Same Private Networks

I'm currently trying to configure a Site to Site tunnel between an IOS Router and an ASA 5505 running 9.1
 
When the private subnet of the IOS Router was 10.0.0.0/24 and the private subnet of the ASA was 172.16.1.0/24, it connected fine.
 
I'm now trying to set it up where both private networks are 10.0.0.0/24, and created network objects, edited the ACL for interesting traffic, and created the twice NAT translation rule, but the tunnels aren't coming up.
 
There is the IOS Router(R1) and the ASA(F2). In between them is one Internet posing router that is just set up to allow both sides to reach their WAN addresses.
 
R1 and F2 have private network (10.0.0.0/24) and need to communicate. Twice NAT can be done all on the ASA to allow this, but I must be doing something wrong. The way I understand it, is that the R1 should see the traffic coming from 10.51.0.0/24 and sending to that traffic. The ASA will take that traffic, and the inside network should see it come inbound as 10.50.0.0/24. So the F2 private network communicates with 10.50.0.0/24 and R1 private network sends traffic to 10.51.0.0/24.
 
I turned on "Debug crypto ipsec" and "debug crypto isakmp" but no output is showing up or giving any hint that it is trying to establish anything. 
 
R1#show run 
version 12.4
hostname R1
crypto isakmp policy 50encr 3desauthentication pre-sharegroup 2crypto isakmp key cisco address 10.2.0.254

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