A pretty intriguing idea-all elevations, from -8 WU to 8 WU in 1/8 WU increments have been already specified in the 128 polys already existing in these maps. (There are 5 maps-1 for each texture set.) If you can live with the limitation of 896 polys per level instead of 1024, you can use these as starting points for your own levels, and you'll find you don't need to define elevation levels for each altered poly. Pretty cool... The readme describes a few potential problems (nothing major), and workarounds for these. If you're building levels that don't need really bizarre elevations, these...

One question that has come up more than most is "How do I get the Marathon CLUT in a form I can use it?" Hamish Sanderson has answered that question, with two files: a Photoshop CLUT file (directly importable), and a PICT containing all the colors in a nice grid, that you can eye-dropper anywhere you need in any painting program. There are also some very useful hints on making Marathon artwork in the readme... if you're doing serious work in Anvil, and having troubles making things look right, get this file. 'Nuff said.

Detailed information on reactivating (or activating, depending on your view) the unused slots available in the M2/Mi Sounds file. This is a great way to add new sounds, without losing what's already there. The doc mentions that you can see the technique being used in "M1->Mi Hunter conversion patch that this doc is bundled with"-while the patch does have these docs bundled, this version is just the docs. If you want the patch, you need to get it from the Alterations section.

A nicely done set of GIFs covering all the solo levels in M1. (Yes, it's been done before... but I don't think any of the originals are in the Archives... and these are pretty complete, with secret areas, save terms, and rechargers.) Worth a look if you're working your way through M1 again (or for the first time...)