make a folder named ~/.tremulous/tremx, put tremx.pk3 and vm_tremx.pk3 in that folder, start the server as tremded.x86 +set dedicated 2 +set fs_game tremx (i'm assuming your server is still on linux)
edit: i forgot to mention, this needs a newer tremded than 1.1.0, if it doens't work with tjw's tremded, then you will need to get it from svn.
also, vcxzet, did you do something to adv dretch damage? i don't remeber being able to take out a turret in 2 bites (edit: it's 1 bite). there are currently 2 things that make it impossible to have a serious game with this mod: adv. tyrant against the unupgraded human defenses, and adv. dretch (and humans not having their shiny new weapons, but that will be fixed later on).
edit2: tyrant nades need more knockback, i won't be happy until i see nade-jumping tyrants