A? Conversion?
Conversion of what?
A total conversion of blockland.
Never seen a total conversion mod? All the GTA games at least have one.
There isn't much to change in Blockland alright but you could change most of the things with the know-how and time.
A new menu
New avatar stuff
Own online servers with what the hell ever.
Not just simple add-ons.
A mod with a own Story Mode in it and add-ons which are JUST available in this mod with everything changed.
Everything sounds silly, I know, but I lack the intelligence to explain any better then that.
Draw yourself a picture of it.