ok, so we're missing a few maps that are classics on the server. (oops, i should have said '4' maps)
the first, of course, is de_deathcookin:
http://www.gamebanana.com/maps/4947
the others:
de_cyberwar_beta_2 - http://www.gamebanana.com/maps/3857 this map takes[place on a motherboard
de_sunstroked -http://www.gamebanana.com/maps/28584 by the same mapper as deathcookin, takes place in a garden outside
de_westwood - http://www.gamebanana.com/maps/12691 needs no introduction