The problem is - it's too late. We've got HGSS. The era of remakes is over. That's like saying that just because... nvm, read the quote under this.
Yay at using Emerald as the base, it's got everything that FRLG has plus the PokeNav. It's a really good choice. Thanks. I thought about FireRed, but, like you said, Emerald IS FireRed IMPROVED. Plus, for GSC remakes, it's overused.
But those maps from Platinum/Palladium Project are bored and tired from every side. Seeing them gets me annoyed, it's like I'm looking at the same hack all the time. Maps? From Palladium? What are you talking about? I made all my maps from scratch - the tilesets and some sprites have been copied from there, nothing more.
I say - don't be afraid of importing some stuff of HGSS. Some elements of HGSS are really fine to be used in a GBA remake (like Rocket Executives, they really need their names and sprites [you may want to make Archer and Ariana more similar to their GSC counterparts, though]). Uhh, no. Remember, my goal is to make as accurate a GSC remake as possible.
Also, what I'd love to see is to see HGSS-like Johto tilesets but in FRLG style. And I'm not talking about those DS-imitating tilesets, as they're mostly ugly and annoying. I'm saying that it'd be possible to make HGSS-based tilesets but in GBA style, without mimicking the pseudo-3D graphics. FireRed graphics suit it much better than any fan-made tilesets would.
Just a simple suggestion. :D This looks really good as is, and I hope to play it when there is a bit more playability, like Cianwood City or such.