Doorway:
Break apart (Ungroup) your hollow box (Select and Ctrl+U).

Select the wall you want to add the door into and re-form it to be just the top part of the wall. Then build the 2 side parts by Shift+Dragging the top part.

The carve tool is dangerous and causes map errors. You can also use the slice tool (3rd from bottom, Shift+X) just play with it til you understand :).

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Round objects:
Use the arch tool or the cylinder tool. First select the Block Creation Tool and you should see:

in the lower tool window on the right. Change block to cylinder or arch. These are not the friendliest but they work.

Personally, I like to use the Vertex Tool for rounded objects (second from bottom, Shift+V) because I have more control. Be careful not to make impossible shapes with this. NO concave shapes and NO uber-thin shapes and NO inside-out shapes and NO volume-less shapes!! Don't do it!!

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Before importing an image into Wally, make sure it is one of these sizes:

32x32
64x64
128x128
256x256

and in 256-color mode. Anything else WILL cause problems, even if you don't notice right away.

If you use any size other than

16
32
64
128
256

Half-Life will scale-down your texture to the nearest one of these and then scale it back up. This makes them look like shit.

It will also do this if your texture is not a square.

I strongly recommend only using these five sizes and ALWAYS make square textures. If you need a rectangle, just fill the left-over part with a solid color and don't use that part.

The reason for all this is that on your Video Card, textures can only be stored as squares, and in powers of 2.

If you look closely at your models in the GAME, you should see the textures are missing some pixels. This may not occur on some hardware configurations, but it will for most people.

You can use http://photobucket.com