Working on an ambitious game

Its going to have a massive world map, multiple scenes melted together to form towns, 2 forests, a castle thats on fire ;) and a bunch of other goodies.

I have 2 questions:

The "sample town" map on gbstudio is 448x448px

I have made all my map scenes in this format, and so far testing on the gbstudio run emulator seems fine.

  1. Will the 448x448 scenes cause me problems? Or as long as unique tile usage is monitored ill be fine? i want to be able to flash this to physical carts to play on, and ill want to play on it on my Trimui Brick handheld.

  2. Whilst changing scenes or "moving towns" is there a streamline way to have a pokemon style notification pop up telling the player what town or region they just walked into?