I worked on the development team that did the one that Notts County use.
There were 4 of us and it took about 8 months to do.
Cobol back end. c# front end running on a unix box.
IIRC we looked at this a while ago and it’s certainly not something a couple of students could set up. There’s an open source ticketing platform as a start but it’d be a big old job to customise and even more so to maintain.
I swear people think software is like graphic design or something and any old fucker can do it with five minutes practice.