Nice! Thanks for placing this on moddb, would definitely reach more people that way.
As for me, unfortunately, I'm still seeing the same errors. This is a fresh Dhewm3 1.5.3 install with nothing but the base pk4s and overthinked installed. Attaching screenshots for your reference. (yes, I tried all permutations between pasting just the .so, both .so and .dll and pasting it in dhewm3/ vs pasting in both dhewm3 and inside overthinked/)