Changing the lab to 3x3 does affect gameplay functionality due to vatbrains (beacons with expensive upkeep which only affect labs) so I'm curious if you considered leaving them at the original size or adding a setting for that. Or do the graphics not look good enough if you do that?

To be honest, I just started playing Pyanodons and didn't really like the look of the labs, so I created this small mod. I'm not entirely sure how vatbrains work, so I followed your suggestion and added a setting to change the size. Graphically it looks a bit strange because it creates some gaps, but it looks pretty normal when using long-handed inserters. Short inserters work too, but it doesn't look the best.

Ah okay. I was thinking the graphics would also be stretched to match the 5x5 size. I was just wondering if it'd look bad due to the resolution for it being effectively lowered. Either way, I've heard several people mention they'd want vanilla lab graphics so I'm glad this mod exists.

I also thought that stretching it would lower the quality. What I didn't know, however, is that Factorio can stretch textures on its own with practically no loss in quality. So this modification was much easier than I expected. That's why the 5x5 lab with stretched graphics now looks exactly like vanilla.