Goldsrc to quake Thread

Hey, does anybody have any idea how to port models and maps from games that ran on the goldsrc engine ( Half-Life, Counter Strike, Team fortress classic) to the original Quake engine? Additionally, If anybody know what version of the quake engine I should use, that would be great.If anybody knows a better category for this to go into, that would be fantastic.

You can port .bsp to quake using the radiant editor, I tested it with a source mod i was making and it worked.

Personally with only a little experience I'd say the Darkplaces engine should suit all your needs. (however i used it 6 years ago, might be better nowadays)
Icculus.org

Radiant.
Icculus.org

Or Jackhammer.
Moddb.com

Cool, thanks.