Found this in the "M1A1 Mapmaking Kit" in the Aleph One utilities section of the Battlecat's Litterbox.

I tried out each of M1 Map Dude's uploads with these and didn't have an issue.

Version notes:

Merge this in your M1A1 maps.

21 downloads, 0 reviews, 1 screenshot, Rating: 0.0 ( 0.0 weighted )

The President's Eternal Shapes

This is an edited Eternal X v110b3 Shapes file. It replaces some of the Marine bitmaps with new ones that match the weapon being held.

Version notes:

• Messed with some color tables in EVIL to get the Marine's Pfhor Staff graphics, and also a less pixellated version of the weapon's item graphic.

• Replaced the Havoc Rifle's grenade clip item with a cleaner version.

• Both the Napalm Canister's and the Pistol Clip's bitmaps have smoother ones in their place, though I don't think they were used.

• Added 3 new bitmaps to the Nightmare sequences. It can now appear diagonally from behind.

• Changed the colors of the Pfhor Staff water scenery item to match the monster's theme. I'm not sure if this was used in the game, though.

• Experimental. Changed the color of one of the alien scenery lamps (The one that looks like a staff crystal) to match the Pfhor Staff's. NOTE: Two files are included in this folder. The one marked with a * contains the latter changes. Try them both and see what you think.

171 downloads, 1 review, 7 screenshots, Rating: 5.0 ( 5.25 weighted )

"Play on Carnage or not at all."

A shapes file that replaces the marine's pistol graphics with dual assault rifle graphics.
Also takes advantage of the Extra Bloom Plugin by adding glow to weapons firing, ceiling lights etc.

Folder also includes files for Floating X HUD; replacements for the pistols in the weapons manifest, making them dual assault rifles.

The Rambo XXXIII physics file from the Anvil sample models is also included.

Version notes:

Deleted glow in the wall collections, which was interfering with High-Res textures.

109 downloads, 0 reviews, 1 screenshot, Rating: 0.0 ( 0.0 weighted )

This is the Anvil Sample Models folder. A lot of people say they don't have or can't get this folder, for some reason or another.

As the manual says, these are "some sample physics models to get you started with editing the Marathon environment. Some changes are minor, while others are immediately obvious and completely change the play of the game!"

The most useful out of these are the Rambo XXXIII physics, which are good for netgames and solo missions.

94 downloads, 0 reviews, 1 screenshot, Rating: 0.0 ( 0.0 weighted )

An underwater map built in and around a scaled-up generator.

You'll need to do some swimming here; set your run key to something easy to reach if you haven't already.

Psycho Physics file:

*Movement is quicker underwater.

*All weapons fire underwater.

*Fusion Pistol fires safely underwater.

---NEW---

*All shots, including monsters' shots, will now fire underwater.

*The S'pht will not float to the top of the map. Instead, their "jump" height is left at it's highest.

The latter additions were made to make Psychomanteus more compatible with the Survival.Lua script. Enjoy.

Version notes:

Weapons and Ammo. Okay, this time I really ramped up the numbers.

Made more items floaty.

Physics no longer merged; I think there was an error with Atque.

265 downloads, 6 reviews, 2 screenshots, Rating: 3.2 ( 3.55 weighted )

A map built from the Electric Sheep trilogy in Marathon Infinity.

It comes with it's own unmerged physics file. The Enforcer will ignore you unless you unless you make him berserk.

The aliens are really just for fun. After being tested in netplay, the ticks only got in the way.

*All lava floors teleport!

Version notes:

Hopefully the last update…

Fixed a bug with the main platform on the right; It's minimum height was set higher than the max height by accident. It will now fall to the proper negative height.

203 downloads, 4 reviews, 2 screenshots, Rating: 2.75 ( 2.85 weighted )