Since the topic was bumped;
I ended up working on a website for the company I work with, and the remaining progression of the map relied on someone that could work out decent terrain for the map - something I've never really been good at.
I've not given up on the project, and would go as far as saying there is a very good chance I will be revisiting it when the website is finished.
I have my eyes set on some sort of tool that would allow me to create the terrain in Blender and move it over to Blockland to progress it - so for now, just be patient, because I certainly haven't forgotten about it.