I'm with Franklyn regarding the Tanaka fenders. I've got a 26"x60mm set on my Atlantis and it took an hour or two to install,
after I gathered all the necessary hardware and tools (spacers, drill, etc). It's not hard work, but one needs to be patient and knowing the tricks of installing metal fenders help. It is worth repeating that unlike plastic fenders, metal fenders should be installed without built-in stress.
As for your questions, the gauge of the Tanaka fenders are similarly
lithe like the Honjos. The finish on the fenders isn't bad at all and are mostly indistinguishable from the Honjos (or at least I couldn't see significant differences). The design and quality of the fittings, however, are noticeably worse than those from Honjo and Bethouds (I don't have experience with VO fenders). Unlike the Honjo, the Tanaka stays are dull and stain easily. The Tanaka daruma bolts, although stainless, also aren't in the same league as the Honjos; it's like cast+plated vs. stamped parts, if that can be an analogy.
Actually, I don't mind the length of the Tanaka fenders. Yes, they're shorter than Honjos, so fender flaps are mandatory. But they're short enough such that I can actually put the bike on "Euro style" workstands because the front flap can bend easily. With Honjos, I have to use a standard Park workstand. Although standard Park workstands are fine, I prefer the "Euro style" workstands as they're more stable. Same thing with roof racks. Fork-clamp racks become an option if you don't have long front fenders getting in the way.
Finally, they're nice enough and cheap enough that I'll be getting another set for my LHT. I think that's probably the best endorsement - a repeat customer.