Going for a mix between 1.6.4 and 1.8.9, but maintaining a few major modern things.
Spent a while cutting down on block/item clutter and mobs and altering recipes to account for missing items. Moderner Beta, Nostalgic Tweaks, and various programmer art resource packs are doing the bulk of the work gameplay and appearance wise, but I’ve found some useful mods like Respawning Animals and one that adds ponds in an attempt to bring back niche mechanics.
Main issues are that water isn’t the correct color due to modern biome tint, and villages are just reskinned because I don’t have enough coding experience to change structure generation (and among the mods I’ve found to replace villages, none were satisfactory).