It certainly work on linux. If it is only ftp, you have to be really tough to set up a server Don't you have a shell access (by ssh) ? Probably you do.
1) q3 is usually installed in /usr/local/games/quake3 directory, and the script running the serv is called q3ded. If it is not there - ask the admin or find it (something like 'find / -name q3ded -print')
2) Make sure you have .q3a directory (dot in the name) in your home dir (lets call it $HOME ). In .q3a you should have excessiveplus dir. In the latter you should have conf dir. So - summarizing - you should have $HOME/.q3a/excessiveplus/conf directory structure.
3) Put cfg containing all server settings (like 'set g_gametype 1'...) into $HOME/.q3a/excessiveplus dir. Lets call this file my.cfg. One of lines of this file should refer to specific xp configuration, for example 'set xp_config "conf/e5r.cfg"'.
4) So, in $HOME/.q3a/excessiveplus/conf you should have file e5r.cfg or other config (specified by xp_config in the mentioned my.cfg) containing specification of available weapons and powerups, anticamp settings and other stuff.
5) If you have all the shit in place run the server with script like this:
[code:1]#!/bin/sh
cd /usr/local/games/quake3
./q3ded +set fs_game excessiveplus +set dedicated 2 +exec my.cfg
[/code:1]
You can run this script under control of a program called screen, which allows you for returning to the server console anytime you want and putting your magic server commands there (no rcon needed).
Good luck

Yeah, in todays time, without a port rotation script, your server will be empty most of time.

Best to use the money elswhere.