Hey there!
Glad to see you've picked this up. I actually saw this mentioned in some reddit post a few days ago, and had already gotten a local copy to run in v0.18.x. I was thinking eventually the Algae Pit and Filtration Plant graphics could use updating. For my capabilities these are pretty lofty goals, but I figured I'd throw it out there.
Thanks for this, I've always been curious to try SeaBlock, but have always shied-away from the full AB mods, etc.