Build Minecraft 1.14.2?

I want to build a computer in 1.14.3 that can be built infinitely long so you can always build in the same order what you find better

I don't quite understand the question. Do you want to build a red tone calculator that can be expanded to any number of bits?

I've done something like that, but still in Beta 1.8 / full version 1.0.0. Who knows if it all still works haha

Should work

No, I mean if a beta 1.8 redstone world in the new version still works as it did then.

Not much has changed, just like Redstoneworld, which was built in 1.8Beta