Minecraft mod

I am looking to commission a Minecraft mod with new blocks and items, based on a clear vision I have for it. I am aiming to keep the mod relatively simple and straightforward in its complexity. The mod should include features and elements that integrate smoothly into the existing Minecraft game world. I would like the mod to be tested for performance and stability before it is delivered. Any suggestions are welcome. I am looking for every block in the game to have different variants (Each block should have a stair, slab, fence post, fence gate, snow, wall, carpet, vertical slab, sign, (head if possible), button, pressure plate, door, and trap door. All of these different block variants would adhere to standard Minecraft physics associated with each variant.