Why can't you connect the flatcar crates on top to create a flat surface, but keep the gaps for spam? That would prevent the gaps from swallowing rockets fired downward from bombs, but allow horizontal spam rockets to pass through. Instead of mesh, you could lay a thin piece of sheet metal on top to make it visually apparent that the crates work differently from those on Badlands. Or you could change the prop on the flatcar to something more fitting for this shape, like piles of lumber.

http://i.imgur.com/YjwBve0.jpg

Similar to what nite said, some of the _u5 clipbrushes get in the way of rocket jumping. Having to stand farther away from the detonation both reduces momentum and makes it harder to judge your rocket jumps. Since making the Shack overhangs nonsolid proved unpopular, could the eaves be removed altogether, like the Shack on cp_reckoner_b1a? (Sorry for bad picture.)

http://i.imgur.com/dRz8vSv.jpg

http://i.imgur.com/jeX8hK4.jpg

http://i.imgur.com/Ny2Wiph.jpg

There's a clipbrush here, too. In my opinion, it doesn't matter for rocket jumping. I have never seen anyone jump off this wall. It doesn't help you get anywhere and it would be a left-handed jump anyway. It's nice to have the clipbrush for Scouts though, as they will no longer get caught on that overhang.

http://i.imgur.com/35Opiig.jpg

On the subject of clipbrushes, the ones on the Right Roof of Mid are really far in for no apparent reason. This makes it almost impossible to rocket jump off that wall. I don't know if this was intended, since this has been around since _final1, and it prevents a fast bomb onto the enemy Saw.

http://i.imgur.com/SlYfYrc.jpg

http://i.imgur.com/80AhCEW.jpg

The stairs in Kitchen are floating at the lower end, the same as in _final1.

http://i.imgur.com/LgSkr4v.jpg

Edit: the walls at the Top Left and Top Right of Mid are different heights from each other. If you're going for a super-high bomb from the Right Roof, RED team has a taller wall to jump off.

http://i.imgur.com/d3IA3nO.jpg

http://i.imgur.com/0cgsI7J.jpg

Thanks. I got it now.

I took a closer look at b1a. It's a beautiful map. I have a few nitpicks though.

The vents at Last are a frustrating to jump onto because of how the ramps above them push you outward as you slide down them.

http://i.imgur.com/UG7MF0I.jpg

There's a similar vent at Second that can't be stood on.

http://i.imgur.com/dRz8vSv.jpg

BLU side has these weird green panes of glass on the left side of spawn.

http://i.imgur.com/PY4pkX2.jpg

Weird visual glitches when looking through the grate wall on Second.

http://i.imgur.com/ZaPrRo7.jpg

http://i.imgur.com/Tf9Wgos.jpg

http://i.imgur.com/IThi4FX.jpg

Wallbug in BLU Lobby

http://i.imgur.com/WTKiSIb.jpg

http://i.imgur.com/OQCzjYS.jpg

The room above lobby has no visible entryway. I know it's inaccessible to players, but it could have a small door in the back like the observation rooms in Portal.

http://i.imgur.com/a0ZOylE.jpg

Maybe make the bands yellow on RED and green on BLU? I got turned around the first time I loaded the map because of the yellow. Too confusing for new players.

Toasty HUD.
The creator abandoned it long ago, but Disquse was kind enough to update it a few times. Hopefully he can update it once Valve finishes all their MM HUD changes.
https://steamcommunity.com/groups/toastyhudtf2
http://www.teamfortress.tv/21801/disquses-hud-fixes

http://www.teamfortress.tv/31026/somethings-up-with-b4nny

A few small errors:
The eves on this shack on BLU side are still solid. The ones on RED side are noclipped.

http://i.imgur.com/oOCoW1A.jpg

Eaves are still solid on BLU and RED sides.

http://i.imgur.com/zbCUtKy.jpg

Eaves are still solid on BLU and RED sides. this one is trickier to deal with because of how that roof leads to the top platform.

http://i.imgur.com/A8LJUE5.jpg

There's a missing texture on the left side of last on both RED and BLU.

http://i.imgur.com/mDFh0uK.jpg

http://i.imgur.com/vkp7tdV.jpg

http://i.imgur.com/4xGm61B.jpg

Added new group CASPERPUGS to the list.
http://steamcommunity.com/groups/CPUGS

https://youtube.com/watch?v=HIJpX1swTTI
Here is a video on possible Demo rollouts.

You should take a break if you're getting frustrated not enjoying playing TF2. You should not try to force yourself to play in order to regain your skill. It will come back if you give it time. If you're still having fun, just keep playing. Your skill will be fine soon.

An Übercharge meter when the Crusader's Crossbow is active, now that Medics can build Über with it.

Muselk.

So is Clockwork.

Thanks. Added to the list.

I hope so. I'd like to add more continents (EU, SA, Asia, etc.) to my list.

Added to the list. Thanks. Why did NA-6s die? It looks like it was active until yesterday.

Added to the list. Thanks.