Hello LZ
The basic tools for abs board are P knife (also called hook knife, sold in stationery stores), pen knife, glue (Tamiya's green cover glue is very good Used) file, sandpaper, of course, grid paper, vernier scale, heat source (candles and sanitary incense are generally used for thermoforming), tools such as vises are also used
As for the processing method, it is basically box Grouping (Using ABS boards to build a box) Stacking (Several ABS boards are glued together and then processed) Thermoforming (Changing the shape through thermoplasticity, which is probably how the curved surface seen by LZ is produced) General model making mainly uses ABS to modify the details Of course, it is very difficult to make parts or even completely homemade models
LZ, if you are interested, you can look for