The Author of the Bigger-is-Better mods (Fenrir) stopped updating them. From his signature:
Turret Editor (by darkconsole) developement is also halted. But on page 8 is a version that claims to be working with the beta (0.20.2/3)
"more commands". I think you are talking about Avorion Commands Package? Well on the first post Aki says:
On the last page is an update from August last year by Anexgohan, which seems to be the newest. But I can't guarantee compatibility with 0.19 mainline or even beta-0.20
There is a (partial?) List of mods reported working with 0.19 and 0.20 here:
https://www.avorion.net/forum/index.php/topic,4961.0.html
And if mods overwrite each others files careful merging is required. Which means you one has to look at the changes every mod does to the vanilla file and integrate all of them into it.
Ahh, so i get it now. "Mod" itself is just customized vanilla file and if different mods use the same file they will replace each other if i just try to put those files in.
As you've said before theres is no mod manager like nexus for skyrim, yes?