TekBase ver. 3

Rather uninteresting visuals (apart from some attempts at fancy realistic decor). The level progression isn't too shabby, but the central room full of slow-moving lifts is annoying to go through. There's not a single exciting or difficult fight, especially if you play with the .deh that increases the health and ammo limits to ludicrous levels.

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[More detailed review]

Finished, ~20 minutes

A long-ish techbase level. There is some fairly competent design; for example, the red key doors/bars provide a simple way to trek around the entire level near the end, without having to deal with the annoying middle section of slow-moving lifts. 
The visuals are underwhelming though. Many rooms feel too big overall. There are some fancy details here and there, such as the ship at the start (and inside of the ship at the end), or at least one multi-part door, but they feel haphazardly thrown in to dress up the bland scenery. The "office cubicle" room makes an attempt at realism which feels pretty unfitting.
There is a .deh file included which modifies the weapons, including making the pistol, shotgun and chaingun faster, changing the rocket launcher to a rapid-fire "flame thrower" (projectiles explode with Arch-vile flame effect), and the plasma gun to a nerve gas weapon (rapidly launches extremely slow-moving baron fireballs; kind of useless). It also greatly increases the health and ammo capacities, making the level a breeze overall.
The enemy placement feels rather uninspired, especially since the abundance of ammo and health makes each fight very easy. There are too many small fries and not enough of the bigger enemies. There is not a single exciting or difficult fight in the level.
The blue key is hidden rather deviously (inside an opaque nukage fall), although not quite impossible to find. The entire section beyond the blue bars gave me trouble because some necessary stairs are surprisingly hard to spot; that part could really use some visual variety beyond the depressing gray. There is a spot where a necessary radsuit is hidden inside a secret (although a rather obvious one, if you think in realistic terms -- within the airlock), but then again, you have so much health that you can afford to run through the damaging area unsuited.