I agree with the notes about the nuclear plasma rifle - it's a top find in a rapidfire game, above a nano pack, I think! Burst mod it for extra fun. :P
I played with entrenchment quite a lot a few weeks ago, and ended up deciding that it's a lot better than it looks! In fact I think it's the best rapidfire master trait! Since resistances in doomrl are additive, that 30% is massive! Assuming you're using appropriate armour (red armour in hell, etc) it more than doubles your lifespan (due to the way resistance is worked out before protection). This all stacks wonderfully with the compulsory TaN, making TaN a lot better than it would be without the entrenchment bonus! It also allows you to go 1xEE, which is the optimal build for many rapidfire weapons, and my favourite starting-out path (EE>SoB>SoB>TH)
On top of all that, it's the only rapidfire master trait that blocks neither berserker, nor eagle eye. In fact it doesn't block anything you'd be likely to want to pick! I think that EE is the most important trait for rapidfire characters, and berserker is the best general trait in the game. Once you have entrenchment+berserker, you get a crazy 90% resistance to all damage types without even wearing armour, which practically turns berserk into invulnerability!
Even without berserking, though, most nasty mid and late game attacks (archvile, revenant, mancubus etc) will attack an entrenched character for 1 dmg - *far* less than the damage that they would otherwise be doing. The cyberdemon, for example, does 17 dmg, reduced to 8 dmg to a normal (no TaN) character with red armour. He deals 1 damage to an entrenched character!
Of course, as noted, you have to be standing still to use it, missing out on the opportunity to run to (100% protection) cover, but I found in my games that the situations where you have to run for cover (ie not already behind cover) are actually no more common than the situations where there's no ideal cover, and you need to just stand there and shoot! For the rest there's always running mode... :D
I think I still prefer masterless for rapidfire builds, but I have little doubt that, assuming good 'sixth sense' and AmmoConservation/Nightmare/nano/nuclearPlasma, entrenchment is leagues ahead of cateye and ammochain. Even without nightmare/nano/nuclear, I still think entrenchment is the only rapidfire master trait I'd be tempted to pick! x
Wasylus:
Nice win here! I, too, am interested in why you skipped the levels. I assume it's because the cathedral isn't suited to non-melee builds, the mortuary is extremely difficult, and the lava pits need multiple envirosuits!