Okay, i just spent about 2 hours doing some tests. Got good news and some bad ones.
The good news is: i got it working without crashing for a good 50 mins. I fixed it by renaming some files. For some reason, the custom sounds in sound\ns_hulk had a .waw (?!) extension instead of .wav, renamed them. There is the same error even in the readme.txt (?!)... Modified the .res file accordingly, also renamed the entry "maps/ns_hulk.res" to "maps/ns_hulk_b3.res". There was also some weird problem with the sound "heart/hearth". I downloaded several versions of the map and it seems sometimes the sound has the filename "heart.wav", and sometimes the filename "heart
h.wav", depending of the download. Weird. Probably someone had already tried to fix the map or something. I know it's confusing and it took me some time to got it working but now this "custom version" of the package doesn't seem to crash anymore.
Now onto the bad news: the map is buggy as hell so what i did is useless.

- Both weldables are working, but when welded, will produce some weird clipping problem. Nothing major, but still, it'll **** off some players.
- A lot of vents can be blocked with structures. There's no func_nobuild or whatever it's called. Again, nothing really major, but it smells fried skulks (elec tf, etc).
- The vent in ms is a ######.
- The worse, major problem(s)/exploit(s) is that there are at least 3 areas where you can build outside. The MS, Cargobay and "the ICU". Structures will sink but keep working. That means invincible structures. Kinda problematic for upgrade chambers which you cannot destroy, invincible obs, rines spawning outside the map, whatever. I was able to drop an invincible TF and 2 sieges outside the ICU and siege hyperdrive hive from there...

Conclusion: As much as i like the map a lot, even if it's huge and very complex, i don't think it's worth it to include it in the map pack as long as those things cannot be fixed. Unfortunately, people WILL exploit it.
@Crispy; Sorry for not answering your post directly, but instead of spending time describing the problem in details i decided to try to fix it right away. But yes, HL1 does create .mdmp files as well. And the type of crash was a "soft lock". Had to alt-tab, and close the process which was indeed "not responding".
God, i got the feeling my english is actually getting
worse over time...

Sorry bout that.