Yes. I found a functional minecraft indev build that has all the modified terrain, The only downside is that this build does not have a paradise biome within the generation code. That is most likely on future and more newer builds of indev. If you were to open any future builds on source code. You can find the png and data for the plate armor, The OG iron armor before it even existed in alpha.
Just to warn when using the indev build's. There's a high chance it will soft lock your pc when trying to run, This is something to do with the build not supported for minecraft in general and yet when trying to take screenshots. It will show a lot of empty chunks. So if you want a full screenshot of a large island. I would recommend you walk around the whole map and test to see if it works.
