Here's two screenshots of a remake of Aerowalk I was working on a few years ago. More cpm22 than Aerowalk. Was still fiddling with geometry when I drifted away from my Quake dev environment.
I'd like to get a version of gtkradiant working again. Might be difficult on FreeBSD.
https://mastodon.sdf.org/media/RNgcmI0ti8tjZij7o9E
https://mastodon.sdf.org/media/x95FgFC81-DQympak14