Happy too soon. It works now, I can bend ports each way, and I can
reach the web servers from clients directly (and the return traffic
through the OpenBSD box) or through the OpenBSD box entirely. Totally
my desired setup.

But I end up getting only half web pages now. It connects, but pages
are returned half, or miss elements towards the bottom of the page.
Seems that now I run into to some weird "timing" or sequence number
problems with the tcp stack

Lost again ...