Half-Life: Under Maintenance

1. Always name your maps so that it's clear what map it is and so that it won't possibly conflict with other maps in the player's maps folder;
2. Never surround your whole map with a box, even during construction. Sometimes you, of course, may be working on a map that's a bunch of floating islands or a small floating station, but in most cases you should have only the geometry that you really need. Boxes around maps increase compile time and cause overdraw. Oh yeah, they also make HLVIS cry.
3. You have very rich detail, but seem to have focused almost only on that. You should complete your map in the first place, detail comes later, so spend your energy on actually making the map and not sugaring it over and over. Also, maps with low detail often are better than many overdetailed ones. It doesn't mean that you always have to keep your maps' geo simple: add as much detail as your skill allows and as long as it doesn't take you away from finishing the map itself. As you get better, you'll be able to produce maps with even larger amounts of detail.
4. Try to restrict yourself from overusing game_text to tell the player what to do - show what to do instead. It's much easier to direct the player's attention towards something if there's no unnecessary detail clutter around. For example let's take that one blue monitor in one of the rooms: the whole room is dark, and the only thing that stands out in all this darkness is the blue computer screen. Of course the player will think that it's something important and, most likely, usable.
5. Try to establish consitensy. The first vent cap that the player has to break is broken by hitting the Use key. However, as you're crawling the vent you see another such vent cap on the left (if I recall correctly), but you can do nothing with it. And the third one breaks when you step on it, but not from hitting the Use key either. So it's not entirely clear how to actually break vent caps in your map, and which of them break. Mark breakable vent caps with a different texture or generally make them look different, and decide whether your vent caps break from touching them, Using them or smashing them with the crowbar or any other weapon. Same applies to doors (not in your map though, just in general). Sometimes some maps have a few doors that open by Using them and the rest are opened somehow else. Unless you have a very strong reason to break the rule, don't do that.

And as for consistency, I do acknowledge the issue however I am afraid that I am not entirely sure how to resolve it.

"Yeah, I noticed that the box kills the compile time but I must have seams somewhere on the map and as a result not having the box means that the map will be in full-bright. I have tried fixing it many times but I can not find this seam."

"And as for consistency, I do acknowledge the issue however I am afraid that I am not entirely sure how to resolve it."