double forwarding

Ok, so my situation is as follows. 3 computers

Home - windows machine
WorkA - CentOS machine, with open SSH port to the world, and all ports open
to an internal network
WorkB - CentOS machine, with no open ports to the world, and all ports open
to an internal network

What I'd like to do is to get access to a VNC server running on WorkB from
Home

What I have been doing as a bit of a workaround is to SSH into WorkA from
Home using PUTTY with :5901 forwarded, then started a VNC server on WorkA,
logged into that from Home, and ssh'd into WorkB from that VNC session with
X11 forwarding. This is kind of like having access to a VNC server running
on WorkB, but there are some caveats, such as if my co-worker, who does most
of her work on WorkA, has to reboot, all of my processes on running on WorkB
terminate.

I feel like I should be able to log into WorkA using PUTTY forwarding say,
:5906, then from that command line, do something like "ssh -L
5906:localhost:5906 WorkB" but that doesn't seem to work for me. What am I
missing?
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