You have now completed the most complicated part of the construction. All you have to do now is place the two pots on the elevations. Make sure that these are not too high, so that as much heat from the tea lights ends up in the oven. At the same time, enough air must reach the candles from the side so that the flame does not suffocate.
When you light the tea lights, the warm air first collects in the inner pot, then between the pots. After a few minutes, the outer pot is already pleasantly heated and can be used as a hand warmer, for example. Even when the candles are no longer burning, the pots continue to release the stored heat for a long time afterwards.
But the pleasant light of the candles also creates a cozy atmosphere. The pots act like a lampshade, so that the flame does not dazzle when watching TV or is reflected on the screen.
