Have you tried spider setcandamage(true)?

Did everyone in your group install and/or uninstall t4m?
Maybe there is a mismatch between versions.

You should be able to slide the edge of the volume in the top view in radiant by pressing "e"

If you installed the game, updates, all the individual modtools updates in order and then pressed the converter button you should be done the first part.
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If your compiling your map for the first time check the ugx wiki to be sure you have the correct buttons checked.
Then compile your mapname_patch
Then compile your mod in the modbuilder tab.
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You shouldnt be getting any missing weapon errors so i would guess you didnt install all the modtools packs in order before pressing converter.

Copy the header and mg42 lines from raw/soundalias/weapons.csv into a new soundalias csv
Include the new soundalias in your mod.csv

Does your model have tag_origin and j_ joint names?
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If you included it in gdt as a "model" and then change it to an "animated model" you might need to delete
raw/xmodel/spider ect then reconvert.

In your picture your missing the kvp
targetname "ZONE NAME"
count 9999
script_forcespawn 1
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The only difference between zombie and crawler kvp is the "script_noteworthy"
Regular zombie can be crawlers by changing the "script_noteworthy" only.

Try the gsc from here.
https://www.mediafire.com/download/u41jcwjj5ytyni0

Make a room(room 1)
Put the xmodel " dest_berlin_barmirror " on each wall and the floor/ceiling.
Put the xmodel "sundirection_arrow" in the middle of the room.
Put a reflection_probe in the middle of the room below the "sun_direction_arrow".
Compile and look at the reflections.
If you had another room (room 2) with mirrors but without a reflection_probe you would still see the sundirection_arrow(from room 1) in the mirrors until you add a probe.
It applies to all reflective (specular) surfaces in the area.
Each probe automatically adds 1 image your map. They are 6 small images combined into 1 strip.
Dont add too many probes and lights until your map is near completion because it makes compiling slower.

Max_map_nodes has nothing to do with pathnodes or traverse.
Max_map_node is from raw/maps/mapname.d3dprt file. Each structural brush adds a line to .d3dprt file, detail and patches don't count, brushes connected get merged into 1 line. Once you get ~65556 in d3dprt lines you get max_map_nodes error.

The error wasn't "max_map_nodes" it was lots of "node without volume" errors.
Each one had a location for the error in launcher and most were brushes completely inside other brushes, brushes not snapped-to-grid, or two brushes not aligned together(snapped to grid).
After fixing them the map compiled.

If you have the cd version you also need to download lan_fixed exe and use that to launch the game. Instructions are in the T4M release topic.
If you have steam you don't need lan_fixed exe

Max_Map_nodes and pathnodes are different.
If there isn't any other launcher errors then its probably bad brushes. Usually launcher has a -1073#### error if it's the structural brushes limit.
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If you don't fix the problem zip or rar your map and send it to me via pm. Ill fix it, post the solution and send it back to you.

Is your first zone called front_zone or start_zone?
what are your trigger kvp script_flag for entering the zone?

Make sure the brushes are all aligned and snapped to grid and have caulked faces and mitered edges.
Try making it into a structural caulk brush, then make a patch on the bad surface and texture it.
If neither work then send the .map to me and i will fix it.