NT Multi-homing 2

This is not an answer, but a comment (side note: the site does not permit comments if there are no answers, so I have to disguise it).

It's not clear to me what you want to do. You have two ethernet segments joined by a bridge. You want to connect those to a (remote?) router. Where does the multihoming come in? Did you plan to use a multihomed PC as the router? Anyway, you then want these two segments to act like one segment with respect to DHCP and WINS.

What do you need the network to do (function) or what does it need to look like (topology) when you're done, and what constraints are there (building layout, cable length, etc)? Without more information there are too many solutions and no way to know which ones might work foryou.