Surf map porting

I help run a server in the dead cousin of CS:S and CS:GO called Half-Life 2: Deathmatch and while we are a small community, some of us very much enjoy surfing. Our surf map options are very limited and while there have been attempts to port over CS:S and CS:GO maps, this usually results in very jittery ramps. If anyone is able to help or give advice on the proper way to port maps to this game please do. To my limited knowledge all that is needed would be to replace info_player_terrorist or _counterterrorist with info_player_deathmatch, and then pack in the textures that are not present in the game's gcf.