Make entity visible from inside

[uacnix]

Hello everyone, I'm trying to "customize" the thegrb93's spawnprotect, what I'm trying to achieve is to make the edges of the spawnbox visible from inside, just like in this pic:
[URL="http://i.imgur.com/4qPLZwk.jpg"]http://i.imgur.com/4qPLZwk.jpg[/URL]
I was also trying to make it not to push away the props inside it, but thats not important for now.

The whole code is almost unchanged, except the color, and can be found here:
[url]http://facepunch.com/showthread.php?t=1194541[/url]

I've also heard that the spawnbox from the picture is available for download somewhere, but although digging in Google, I've found nothing except the thegrb93's spawnprotect.

Any help is appreciated :D

[Rubat]

Draw the model twice, once with normal scale, and once with negative scale.
Or use $nocull material on the model
Or draw the model twice with [url]http://wiki.garrysmod.com/page/render/CullMode[/url] calls.