I wanted to share the progress I've been making in improving the tool bls2brs. I've been adding mappings for a ton of commonly used Addons and also making existing mappings more accurate using microbricks and more careful logic for brick orientations in special cases.

improvements to default brick mappings, music bricks now use the brickadia speaker brick!
The main challenges with this kind of thing are that brick rotations in Blockland are never consistent. Even within the same Addon the bricks will sometimes be oriented differently depending on the size of the brick. There has to be a lot of trial and error and testing to get this right.
There are hundreds of bricks that will start converting in the next release so keep your eyes out! You can follow the releases at https://github.com/brickadia-community/bls2brs to get the next update.