[Other] A Development Order Question

[Justifis]

Okay, so I think I've finally gotten nearly every basic down when it comes to ROM hacking. I've been making very good progress designing a new region with all the base tilesets, as well as scripting in events and trainers.

My question is: Would it be possible for me to complete this entire game using only the base Emerald tilesets and then go back later to do a complete graphical overhaul, such as importing new tilesets?

Also, is there anyway for me to edit my title screen multiple times? I edited it earlier and wasn't completely happy with it, so I tried to change it again, but nothing happened. unLZ seemed to not repoint the data for some reason. Thankfully, I made a backup. But is there a way to change it over and over without having to revert to a backup?

Bonus question: Why is the red arrow in my dialogue boxes glitchy and is there any way to fix it?

 

[JosefigGaming]

1. Yes, you can create your game and later on change the tileset, just make sure you replace your own grass tile by another grass tile, your tree tiles by the other tree tiles, and so on, or else you'll need to remap everything
2. I don't know, but I believe you can change it more than once
3. Dunno, sorry

 

[Justifis]

Yes, you can create your game and later on change the tileset

That was my biggest question, so thanks for the answer.

Anyone else help me with the others?