Without opening it up I’m fairly sure the bumps are the spot welds for the stand-off’s that hold the PCB/display (two above and two below). Maybe the spot welding has deformed the front panel (I’ve seen that before) and rather than ‘flatten’ the weld or grind it back they’ve just primed/painted the panel.
Others with access to an older OT may be able to confirm but I’d suggest that if the front panel was of a thicker gauge of steel those deformities would either not be there or be greatly reduced.
I doubt very much that the lumps are due to anything inside the unit fouling on the front panel and ‘pushing’ the panel outwards; the force needed to deform the panel would be very high indeed, much more than the PCB/internals would withstand.
As I mentioned earlier it looks like they have reduced costs in the manufacture of the case. Maybe there’re looking to move to an OT MK3 and are trying to save money with the current OT builds? Or freeing up development resources for other projects such as the Model : Samples. Either way it doesn’t smack of ‘premium’ which is disappointing on a +£1000 instrument. My verdict? Must do better, especially at this price point. My AR2 is leagues ahead in terms of build quality and the cheaper Digitone is finished to a higher standard that this OT2.