Using reference photos of the actual mini, and assuming the Warhammer is 12 meters tall, then by the mini width the warhammers should be 1.8x bigger on the Luthien dropship. Or, the dropship, like others said, is not a 76 meter internal diameter like it should be, but 135 meters wide if those are full sized whammers.
I agree, the drawings work better with the scaled up mechs. It almost feels like it was originally supposed to, because there are 16 bays and the Union-C is supposed to carry 15 mechs, but then someone edited in the wrong size of mech outline. I don't know what a "Fighting Bay" is (fighter? but then Union-Cs don't carry fighters), but there are 16 bays.
What does this change? Not much in terms of how underutilized the space is when I make the warhammers bigger. The beds, if the dropship was scaled to 78 meters wide, are still 5.6 meters long... because the dropships are massively too big and they had trouble filling the space. The purple squares are the area the 1.8x larger 12 meter tall 6.75m wide 8.5 meter to barrel long upscaled warhammers. And I could fit a ton more of them, heck the blacked out space, presumably the airlocks for the 4 doors, dont even prevent me from easily putting 12 warhammers in the bay. If you optimized the space even a little, like not having a totally useless 50 meter ramp to go skiing on, the aerofighters fit too.
I'm glad that I'm not totally out to lunch on at least one thing. Your blocking is similar enough to mine (at least in scale) that I feel like I'm on the right track. I think the only difference is our interpretation.
You feel that there's a lot of underutilized space, but I don't think you'd pack them in like sardines. There's approximately room, in both of ours, working from the outer wall, for a mech bay, a circular walking area to move about 1 (safely, or at most 2) mechs abreast, a central whatever (core in my case, elevator/ramp/turntable/whatever in their case), then the walkway again on the other side and an opposite facing mech bay. My interpretation is that 90% of mech repairs would take place in the mech bays, which would have gantries, umbilicals, crane access, etc. Only occasionally would you have to do a lay down on the walkway or something. We still haven't accounted for workshops, mules and, it just occurs to me, probably a somewhat hefty magazine. Where are all the ammo reloads stored, such that somebody does't blow themselves up when doing hot work? The main walkway would still give a feeling of 'openness,' but I don't think it's necessarily useless.
There are other problems with that drawing still (as you said, the crew quarters are too large, there's no accomodation for the mechwarriors, galley space, ops room (TOR) and it's even missing at least one full deck and the cargo bay), but yes, at that scale, it's better.
ETA: If you look at my sketch, there's a dashed line. That represents the outer limit of the full height deck. The walls curve in/out from there (in the vertical cross section, I used triangles, and eventually I'd use curves, but the space difference isn't that much), with the outside maximum represented by the solid line. You can see that you can't fit mechs right up against the outer wall. Maybe I can distribute the magazines around the outer wall. They'd be enclosed, right up against the hull and if there was an explosion in one, just like CASE, it'd be meant to vent to space.
ETA ETA: A better example of blocking out/space use than an aircraft carrier is a modern frigate. You
could block out two helicopters on a deck plan, one on the flight deck and one in the hangar, but you couldn't operationally use the hangar one with one on the flight deck. That doesn't make the flight deck wasted space (if for no other reason, that it's sometimes used for PT, shooting, receptions and of course, BBQs).