Yeah. Work on the skybox. It looks bad, plus
http://dl.dropbox.com/u/1490725/arena_hardhat_b20001.jpg shows the map is floating.
The first Clipcheck of 2011!!!! Hardhat is so simple, this is more a normal feedback post than a clipcheck. Most of the following applies to both sides of the map, so fix it on both sides. Only one, maybe two, don't apply to both sides.
http://dl.dropbox.com/u/1490725/arena_hardhat_b20000.jpg
Red texture in BLU spawn
http://dl.dropbox.com/u/1490725/arena_hardhat_b20002.jpg
That's actually dev texture. So on top of the fact that you need to texture that doorway wall (and the doorway's ceiling), fix the lighting wizardry going on.
http://dl.dropbox.com/u/1490725/arena_hardhat_b20004.jpg
The nails along the wall, the saw, and the tiny box of nails are all solid. Make them not. Also, on each doorway for that middle shack on the side, you've got different textures for the doorway wall. On one wall, dev. On the two inner, the same texture as the inside of the shack. On the other door's outer face, you've got metal. Even it out, make it uniform.
http://dl.dropbox.com/u/1490725/arena_hardhat_b20007.jpg
Clipping
http://dl.dropbox.com/u/1490725/arena_hardhat_b20008.jpg
Clip the pole on the right so that I may walk out on the right side of the door and not get stopped. A simple angled clip will do the job.
http://dl.dropbox.com/u/1490725/arena_hardhat_b20009.jpg
You're doing good, Wall. I shall salute you while on this sign.
http://dl.dropbox.com/u/1490725/arena_hardhat_b20010.jpg
I can actually crouch in through the hole there and get another way into the point. You only wanted two dropdowns, not four, right?
http://dl.dropbox.com/u/1490725/arena_hardhat_b20011.jpg
What is the point of this. I ran that direction with the intent of walking off the ledge. I was prevented from doing so by a tiny shin-high wall that I barely saw that seems to serve no purpose.
http://dl.dropbox.com/u/1490725/arena_hardhat_b20012.jpg
Why must I go left? Isn't right just as acceptable?
http://dl.dropbox.com/u/1490725/arena_hardhat_b20013.jpg
A similar issue to 0008, clip the pole at the doorway so I don't get stuck walking out.
http://dl.dropbox.com/u/1490725/arena_hardhat_b20014.jpg
I can build back here.
Yep.