Or even better example: https://www.youtube.com/watch?v=T3pHRBBUSWo&list=PLhoXNQqrCmEfAaTf0AfQ1Ztxmz2DoZiCk&index=54

Commet was too long, so I need to separate it in two:

I wold like to recreate various mechanisms, like those examples: https://www.youtube.com/playlist?list=PLhoXNQqrCmEfAaTf0AfQ1Ztxmz2DoZiCk

More than once, I was having a need to create some form of "slider" like in this example:
https://www.youtube.com/watch?v=mUGOtdwxvYI&list=PLhoXNQqrCmEfAaTf0AfQ1Ztxmz2DoZiCk&index=52

Trying those with regular 1x diametar size and necessary wider hollow gap in 2x2 size become too impractical for using in game. 0.5 diametar timber placed between gap made just 1x block size should do a trick.

Centered weight model mostly to be able to attach on downmost part of keel made by centered version of rudder. In some cases attaching 2 pieces side by side is too much and it looks odd. I would like to have that one for both, aesthetic and practical usage.

In some ship designs I need to add weight balance to make ship stable, sailboats for not tiping over and steamboats need even more to fight with countertorque generated by engine and propeller. If you put weight on bottomest part of ship it is much more effective and you need to use less weight for same result. Less balance weight - better performace and less energy loss.

As for 0.5 timbers, I need those for various parts of mechanisms, mostly to be used with 1x1 catch blocks. So far, I have used 0.5 pulleys, but you need a lot of dem, and over longer axes, you can't properly attach them on both catch blocks. Being smaller in diameter helps a lot to prevent creating closed loop by accident and causing crashing game to desktop.

The centered model is possible to be done only by sbc editing. A .5 timber on the other hand is not. That would require a separate model (not a big deal though). Why do you need it? It's quite specific parts i cannot see much use for...

Would be possible to have "centered offset" version of weight cube ? Does it require mesh model change, or it is possible just to create new part by editing *.SMB file, if does not require mesh change and texture is same.

Also, to create 0.5 round timber model, would it be possible just by editing *.SMB file ?