Disable selection/removal/snapping to certain buildings/belts/pipes.

When building a multi-layer, compact structures with a lot of pipes and belts, it becomes super tricky to select product ports, route belts/pipes around other ones, etc.
The main issue is that pipes/belts snap to the wrong counterparts. 'Toggle snapping' somewhat helps, but not in all situations. For instance if you have a lot of pipes on lvl 1-3 and you need co connect smth on lvl 0, it's super hard to do. The only workaround sometimes is to remove the top layers and build from bottom up.
I see two possible solutions:
1. Disable selection of / snapping to individual constructions. Like a new 'construction pause' mode that one can assign and it will disable any select/snap/remove operations with that piece.
2. Global vertical section tool (like in CAD systems) that disables everything above it. User can enable and move it up/down to get to desired layer.
Disabled pieces still work as obstacles, but you cannot select/remove/snap to them.
I prefer option2, it should be easier to use.