Yes it works! Muhahaha. OK, I don't need help with the wonders multi produce anymore, I managed to change the DLL and get it running in the game the way I wished.
On a more serious side - I am right there with you. I code for a while now and am a big supporter of coding in a way which makes it easy to modify.
The issue of dedication is more of a problem, as I am sadly usually very busy with a hard to predict schedule. So I don't know how much I can actually contribute sadly.
The muti-build change I made was just very easy, I had to delete the condition of checking for wonder or project that broke out of the production while loop.
I can try adding a flag which can allow for each of the criteria (food production, wonder, project) to be controlled so it can be allowed to multi produce.
I am also still curious about the issue of the cultural overflow I had i the past, though it might have been solved since then.
What I can assist with, and might be good at, and it takes me little time - is real time debugging. I have some memory editing experience and can help resolve specific bugs by detecting the flow like this.
Regarding the build - it seems to be a bit of a mess, because different mods seem to have merged here, but looking at the code, there are quite a few situations in which production will convert to gold instead of going towards the next item. Keep in mind that the change I made can be considered very bad by some, because it allows you to use overflow to pre-build a wonder (by stacking a building for creation that can be insta-finished, than doing it and rolling over the accumulated production to the wonder).