Some help needed setting up NAT in 2x Airport network

I'm wondering if anyone can give me some advice on how to get port forwarding to work on my network.
DSL comes into the house downstairs and from the DSL modem it goes right into an Airport Express. I am on the second floor though, and the Airport's signal isn't strong enough for my G5's antenna to pick up. That's why I have another Airport Express on the first floor, expanding the Airport network.
The two Airport Express units are in a "WDS".
I would like to run a home server, so I have to open up port 21 and forward it to my G5, which gets its internet from the 2nd Airport Express unit.
How do I do this? The Airport's have IP's in the 10.0.0.x range. The G5 is in the 192.168.2.x range because it also connects to a wired router. Do they both have to be in the same range?
Port Forwarding seems disabled on the Airports because I use WDS. I can check the Distribute IP checkbox in the Network tab, but then I get a warning it shouldn't be enabled with WDS on.
Any ideas?
Thanks in advance,
Maarten

Hi Henry,
I managed to get it working. I thought port fowarding was greyed out on both Airport units, but it only was on the relay one. Not on the main one. Also, I first accidently forwarded port 21 to the G5's wired IP address instead of its wireless (Airport) IP address.
The setup is exactly as you described (your 2nd paragraph). The wired router is only there to connect 4 PC's to the G5. They don't need internet (I don't want Windows to have internet), they just need just data transfer with the G5 (MIDI data and VNC control). It's on a different IP range than the Airport network.
One issue I am still experiencing is that when Airport is turned on on the G5, the router network (the 4 PC's) don't appear in Finder > Network. When I turn off Airport, the router network appears within a second. So there is a file sharing conflict or something there.
Thanks for your help,
Maarten

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