Cisco Firewall :: PAT / NAT Overload On 5510?

There is a new office which is going to be on a separate internal subnet (192.168.254.x), and need this to be port address translated to one public address (212.23.51.108). Ive given it a go on the ASA5510, but not sure if Im doing this right.
 
3 of the internal addresses need port redirection:
 
192.168.254.10 - public port 33510  - private port 3389
192.168.254.11 - public port 9940  - private port 443
192.168.254.173 - public port 3390  - private port 3389
port 80 and 443 opened for 192.168.254.10
 
I have a test pc setup and connected to the internal 192.168.254.0 network (gave it static of 192.168.254.10), it is reaching the internet, and its public IP is seen as 212.23.51.108, however how do I test to see if port 80 or 443 is open for this ip?
 
Tried using the cli but gave up and looked at doing int in ASDM, however cant see the option in ASDM for NAT overload, so ive tried configuring this with Dynamic NAT which looks about right.....
 
This is the relevant config so far as far as I can see.
 
global (outside) 2 212.23.51.108 
nat (inside) 2 192.168.254.0 255.255.255.0
nat (inside) 2 access-list inside_nat_outbound

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