You could change those, but you had 1-stud grid, 1/5 stud grid, and no grid. Parts were no bigger than 512,512,512 and no smaller than 0.2, 0.2, 0.2, but people used block meshes back then for building.
Auto-join is locked to the one-stud grid (as far as I’m aware).
Here are the grid sizes for different form factors (for the one stud grid):
- Plate: 1, 0.4, 1
- Brick: 1, 1.2, 1
- Symmetric: 1, 1, 1
- Custom: 1, 1, 1
People typically used the advanced dragger for building things like vehicles, and the auto-join move and resize tools for building landscapes and terrain.
Parts that are spawned in have a size of 4, 1.2, 2.
Some more things:
For a hole effect, use the hole instance. Many games used these back in the day for exhaust pipes on cars.
SetNetworkOwner to the server on the players. Players were server controled (I think).
In my opinion, it’s quite complicated to do this in modern studio because of all the quirks so I recommend building your map in a 2009 studio version. It helps a lot and will be a huge time saver.