ur leavin out the time it takes to design (if you dont just use gyt’s original design) + bugtest the spawning/minigame code, how to handle disconnects, elo, lobby and weapon selection, rewards, saving
sure just making a tournament bracket which matches people isnt hard, but that isnt all there is to a tournament server. id put the time estimate at double or three times your estimate, which isnt a lot tbh. eg one weeks worth of work assuming you can build fast and not get distracted