linux box in a windows NW

I need to attach linux box (legitimate reasons!) to the windows
network at work, and they have agreed as long as they dont hae to do
anything (overworked already+++ - im sympathetic )

Ive got one wall socket for the LAN

ive got this far

www --MS Proxy--wall socket-- eth0-linux box with apache +myapp
linuxbox- dhcp
server---eth1----windows box

im using ntlmaps to authenticate the gentoo linux box at the MSproxy

ie
www--MSProxy (62.11.11.11:8080)--------eth0----127.0.0.1:5865---server
stuff

i now want to connect the windows box to the www.

The browser on the windows box points to 62.11.11.11:8080

not sure how to proceed now. i was going to use shorewall (its what im
familiar with) to forward incoming TCP stuff on eth1 (loc) to eth0
(net) but dont know how to sort out the ntlm proxy on 127.0.01:5864

can I also redirect the browser requesting 62.11.11.11:8080
internally, through the linux box, the ntlm-proxy and then out ?

should i be looking at doing a lot of this with squid?

pointers please

there is a big howto coming whenthis is all done!