I'm doing a Sevii Islands hack demake for Gen 1. It'll have all the Pokémon, areas and most of the events. I'll do a beta with the first 3 Islands and continue if there's any interest. You can even trade the Gen 2 Pokémon you catch to GSC proper (though one way only).

Sevii RB progres. Much harder to make decent maps for Gens 1 and 2 than 3 but I'm getting better. I had to make a second map bank for Sevii because even if you replace all of the unused maps you still wouldn't have enough room for everything. I also found a trick that will let you trade Gen 2 you catch in this hack to official GSC (but it's one way only).
I will likely release a beta with the first three islands and continue if there's still interest.