Hello Franco and welcome.
Sounds like you are in a good position to get a CNC built when you are ready given you have access to machines.
I can't see any reason why a combined laser / router isn't feasible as they are basically the same machine. You might have to take into acount when designing it that you need room / mountings for the flying mirrors.

On one forum I'm on a guy is building his own laser from a kit of parts from the US. Slow going as he's pushed for time and money but he's making a nice job, only small, A3 sized but the concept could be scaled up.

You only need the laser / optics section to graft onto a larger machine.