How to make a custom set draftable?

[Mattias]

| Open

I have a friend who have a cube which is rarity based and I would really like to make it a draftable set.
I did the whole rarity list as a .txt and put it into the "edition"-folder, from there I just assumed I was supposed to do an addition in the "blockdata/blocks" and that's is where I am stumped. The thing is that there are no basic lands in the boosters so I just tagged all nonbasics as M and did a 10/3/1/1 C/U/R/M split in the edition txt under Metadata.

When I put in "Rarity Cube, 3/6/RTC, RTC" after the KTK line in the blocks.txt the program refuses to start.

What am I doing wrong so far and what more do I need to do? Is this even possible to do without touching too "codey" things?

Just found the Fantasy block draft thing and got it