Thermostat ideas needed

So I found an Arduino mega and touch screen module I’d completely forgotten I’d bought a year or two ago (previous project idea for a friend that never came to fruition).
Now thinking of using it as a manual thermostat display / on/off / temp set.

Anyone done this before and have a general place to point me to for implementation info? Most of my HA built thermostat is switches and stuff so it’d just be needing to show the temp info and interactive buttons.